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LOS ANGELES, CA - JULY 08: Musician Adam Levine of the band Maroon 5 performs at the Maroon 5 Video Shoot for "Moves Like Jagger" with Christina Aguilera on July 8, 2011 in Los Angeles, California. (Photo by Christopher Polk/Getty Images for A&M/Octone) ( 65521197 )

Adam Levine was named People's Sexiest Man Alive of 2013.

"70's porn called. It wants it's vibe back. Immediately," wrote Adam Levine's fiancee Behati Prinsloo on Instagram.

TODAY -- Pictured: Adam Levine appears on NBC News' "Today" show -- (Photo by: Peter Kramer/NBC/NBC NewsWire via Getty Images) ( NUP_159143_0576.jpg )

THE VOICE -- Episode 419B "Live Finale" -- Pictured: Adam Levine -- (Photo by: Trae Patton/NBC/NBCU Photo Bank via Getty Images) ( NUP_156276_3814.JPG )

LOS ANGELES, CA - JULY 08: Musician Adam Levine of the band Maroon 5 performs at the Maroon 5 Video Shoot for "Moves Like Jagger" with Christina Aguilera on July 8, 2011 in Los Angeles, California. (Photo by Christopher Polk/Getty Images for A&M/Octone) ( 65521211 )

LOS ANGELES, CA - JULY 08: Musician Adam Levine of the band Maroon 5 performs at the Maroon 5 Video Shoot for "Moves Like Jagger" with Christina Aguilera on July 8, 2011 in Los Angeles, California. (Photo by Christopher Polk/Getty Images for A&M/Octone) ( 65521219 )

AP Photo/Carlo Allegri, file

FILE - In this Feb. 7, 2013 file photo, recording artist Adam Levine attends the launch of "Adam Levine Signature Fragrances" at Macy's Westfield Century City, in Century City, Calif. Levine is named Sexiest Man Alive 2013 by People magazine announced Tuesday, Nov. 19, 2013. He is a coach on the NBC's hit series, "The Voice." (Photo by Paul A. Hebert/Invision/AP, File) ( People-Adam Levine )

Adam Levine in "Moves Like Jagger" Music Video. Photo credit: YouTube

LAS VEGAS, NV - SEPTEMBER 21: Adam Levine of Maroon 5 performs onstage during the iHeartRadio Music Festival at the MGM Grand Garden Arena on September 21, 2013 in Las Vegas, Nevada. (Photo by Denise Truscello/Getty Images for Clear Channel) ( 179684141VL00133_iHeartRadi )

TORONTO, ON - SEPTEMBER 07: Adam Levine arrives at the "Can A Song Save Your Life?" premiere during the 2013 Toronto International Film Festival held at Princess of Wales Theatre on September 7, 2013 in Toronto, Canada. (Photo by Michael Tran/FilmMagic) ( 76228345 )

NEW YORK, NY - SEPTEMBER 03: (Exclusive Coverage) Adam Levine attends the Adam Levine fall press preview for Kmart collection on September 3, 2013 in New York City. (Photo by Kevin Mazur/WireImage) ( 179183800LL001_Adam_Levine_ )

LAS VEGAS, NV - SEPTEMBER 21: Singer/guitarist Adam Levine of Maroon 5 performs during the iHeartRadio Music Festival at the MGM Grand Garden Arena on September 21, 2013 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images for Clear Channel) ( 179684141EM130_iHeartRadio_ )

THE TONIGHT SHOW WITH JAY LENO -- Episode 4554 -- (EXCLUSIVE COVERAGE) -- Pictured: Singer Adam Levine during a commercial break on October 28, 2013 -- (Photo by: Paul Drinkwater/NBC/NBCU Photo Bank via Getty Images) ( NUP_158870_0410.jpg )

THE VOICE -- "Live Show" Episode 513B -- Pictured: Adam Levine -- (Photo by: Trae Patton/NBC/NBCU Photo Bank via Getty Images) ( NUP_158914_0692.JPG )

THE VOICE -- Pictured: Adam Levine performs at a special live performance event celebrating the top 12 artists of NBC's Emmy award winning hit "The Voice" at Boulevard 3 in Hollywood, CA. "The Voice" live shows continue on Monday, November 11th at 8 p.m. ET -- (Photo by: Trae Patton/NBC) ( NUP_158908_1062.JPG )

UNIVERSAL CITY, CA - NOVEMBER 07: Recording Artist Adam Levine attends the "The Voice" season 5 Top 12 red carpet event at Universal Studios Hollywood on November 7, 2013 in Universal City, California. (Photo by Paul Archuleta/FilmMagic) ( 77256753 )

THE VOICE -- "Live Show" Episode 514B -- Pictured: Adam Levine -- (Photo by: Trae Patton/NBC/NBCU Photo Bank via Getty Images) ( NUP_158924_1570 )

NEW YORK, NY - NOVEMBER 15: (EXCLUSIVE COVERAGE) Behati Prinsloo and Adam Levine are seen in the West Village on November 15, 2013 in New York City. (Photo by Alo Ceballos/FilmMagic) ( 77384684 )

CARSON, CA - MAY 11: Adam Levine of Maroon 5 performs onstage during the 2013 KIIS FM's Wango Tango held at The Home Depot Center on May 11, 2013 in Carson, California. (Photo by Michael Tran/FilmMagic) ( 74614959 )

CARSON, CA - MAY 11: Adam Levine of Maroon 5 attends 102.7 KIIS FM's Wango Tango at The Home Depot Center on May 11, 2013 in Carson, California. (Photo by Jason LaVeris/FilmMagic) ( 74614065 )

BEVERLY HILLS, CA - MAY 14: Recording artist Adam Levine onstage during BMI's 61st Annual Pop Awards at the Beverly Wilshire Four Seasons Hotel on May 14, 2013 in Beverly Hills, California. (Photo by Paul A. Hebert/Getty Images) ( 74656799 )

NEW YORK, NY - JUNE 14: Singer Adam Levine of the band Maroon 5 performs on NBC's "Today" at the NBC's TODAY Show on June 14, 2013 in New York, New York. (Photo by Mike Coppola/Getty Images) ( 75096209 )

NEW YORK, NY - JUNE 14: Adam Levine visits "Late Night With Jimmy Fallon" at Rockefeller Center on June 14, 2013 in New York City. (Photo by Theo Wargo/Getty Images) ( 75100564 )

BEVERLY HILLS, CA - JULY 27: (L-R) Coach Adam Levine speaks onstage during "The Voice" panel discussion at the NBC portion of the 2013 Summer Television Critics Association tour - Day 4 at the Beverly Hilton Hotel on July 27, 2013 in Beverly Hills, California. (Photo by Frederick M. Brown/Getty Images) ( 174413290KC00265_2013_Summe )

THE VOICE -- Season: 5 -- Pictured: Adam Levine -- (Photo by: Mark Seliger/NBC/NBCU Photo Bank via Getty Images) ( NUP_156914_0927.JPG )

THE VOICE -- "Blind Auditions" -- Pictured: Adam Levine -- (Photo by: Trae Patton/NBC/NBCU Photo Bank via Getty Images) ( NUP_157105_4013.JPG )

Adam Levine started off hosting Saturday Night Live without a shirt.

Christopher Polk, Getty Images ( 118657273JF018_Maroon_5_Vid )

Jamie McCarthy, Getty Images ( 132076450JN058_2011_Victori )

LOS ANGELES, CA - JULY 08: Musician Adam Levine of the band Maroon 5 performs at the Maroon 5 Video Shoot for "Moves Like Jagger" with Christina Aguilera on July 8, 2011 in Los Angeles, California. (Photo by Christopher Polk/Getty Images for A&M/Octone) ( 65521186 )

LOS ANGELES, CA - JULY 08: Musician Adam Levine of the band Maroon 5 performs at the Maroon 5 Video Shoot for "Moves Like Jagger" with Christina Aguilera on July 8, 2011 in Los Angeles, California. (Photo by Christopher Polk/Getty Images for A&M/Octone) ( 65521191 )

LOS ANGELES, CA - JULY 08: Musician Adam Levine of the band Maroon 5 performs at the Maroon 5 Video Shoot for "Moves Like Jagger" with Christina Aguilera on July 8, 2011 in Los Angeles, California. (Photo by Christopher Polk/Getty Images for A&M/Octone) ( 65521208 )

LOS ANGELES, CA - JULY 08: Musician Adam Levine of the band Maroon 5 performs at the Maroon 5 Video Shoot for "Moves Like Jagger" with Christina Aguilera on July 8, 2011 in Los Angeles, California. (Photo by Christopher Polk/Getty Images for A&M/Octone) ( 65521207 )

NEW YORK, NY - AUGUST 26: Maroon 5 frontman Adam Levine attends the Snapple Tea Will be Loved launch at the Hard Rock Cafe, Times Square on August 26, 2011 in New York City. (Photo by Lisa Hancock/FilmMagic) ( 66042612 )

VALENCIA, CA - OCTOBER 18: Singer Adam Levine attends the grand opening of M. Fredric at Westfield Valencia Town Center on October 18, 2011 in Valencia, California. (Photo by Charley Gallay/Getty Images For Westfield) ( 66915693 )

NEW YORK, NY - NOVEMBER 09: Adam Levine of Maroon 5 performs during the 2011 Victoria's Secret Fashion Show at the Lexington Avenue Armory on November 9, 2011 in New York City. (Photo by Jamie McCarthy/Getty Images) ( 67235884 )

NEW YORK, NY - NOVEMBER 09: Adam Levine of Maroon 5 with model Anne V on the runway during the 2011 Victoria's Secret Fashion Show at the Lexington Avenue Armory on November 9, 2011 in New York City. (Photo by Kevin Kane/FilmMagic) ( 67276238 )

LOS ANGELES, CA - NOVEMBER 20: Singer Adam Levine of Maroon 5 performs onstage at the 2011 American Music Awards held at Nokia Theatre L.A. LIVE on November 20, 2011 in Los Angeles, California. (Photo by Kevork Djansezian/Getty Images) ( 67413752 )

BEVERLY HILLS, CA - JANUARY 15: Musician Adam Levine of the music group Maroon 5 arrives at the 69th Annual Golden Globe Awards held at the Beverly Hilton Hotel on January 15, 2012 in Beverly Hills, California. (Photo by Jason Merritt/Getty Images) ( 67999323 )

INDIANAPOLIS, IN - FEBRUARY 02: Singer Adam Levine performs onstage during VH1's Super Bowl Fan Jam at Indiana State Fairgrounds, Pepsi Coliseum on February 2, 2012 in Indianapolis, Indiana. (Photo by Christopher Polk/Getty Images for Vh1) ( 68254275 )

LOS ANGELES, CA - FEBRUARY 12: Singer Adam Levine of Maroon 5 arrives at the 54th Annual GRAMMY Awards held at Staples Center on February 12, 2012 in Los Angeles, California. (Photo by Jason Merritt/Getty Images) ( 68420528 )

CARSON, CA - MAY 12: Singer Adam Levine of Maroon 5 performs at 102.7 KIIS FM's Wango Tango at The Home Depot Center on May 12, 2012 in Carson, California. (Photo by Kevin Winter/Getty Images) ( 69732543 )

NEW YORK, NY - MAY 14: Musician Adam Levine attends NBC's Upfront Presentation at Radio City Music Hall on May 14, 2012 in New York City. (Photo by Jemal Countess/Getty Images) ( 69761289 )

NEW YORK, NY - JUNE 29: Singer Adam Levine of Maroon 5 performs on NBC's "Today" at Rockefeller Plaza on June 29, 2012 in New York City. (Photo by Michael Loccisano/Getty Images) ( 70398245 )

NEW YORK CITY, NY - JULY 03: Adam Levine is seen on the set of "Can a Song Save Your Life" on July 03, 2012 in New York City. (Photo by Josiah Kamau/BuzzFoto/FilmMagic) ( 70461146 )

LOS ANGELES, CA - AUGUST 12: The Voice's Adam Levine attends the NBCUniversal's "The Voice" Press Junket and cocktail reception on August 12, 2012 in Los Angeles, California. (Photo by Christopher Polk/Getty Images for NBCUniversal) ( 70911346 )

SINGAPORE - SEPTEMBER 22: Adam Levine lead singer of Maroon 5 performs during the 2012 F1 Singapore on September 22, 2012 in Singapore. (Photo by Chris McGrath/Getty Images) ( 71499013 )

NASHVILLE, TN - DECEMBER 05: Musician Adam Levine of Maroon 5 perform at The GRAMMY Nominations Concert Live!! post concert held at Bridgestone Arena on December 5, 2012 in Nashville, Tennessee. (Photo by Kevin Winter/WireImage) ( 157947893KL00002_The_GRAMMY )

LOS ANGELES, CA - FEBRUARY 06: Adam Levine of Maroon 5 attends the launch of his signature fragrance event held on February 6, 2013 in Los Angeles, California. (Photo by Michael Tran/FilmMagic) ( 73182934 )

LOS ANGELES, CA - FEBRUARY 10: Singer Adam Levine attends the 55th Annual GRAMMY Awards at STAPLES Center on February 10, 2013 in Los Angeles, California. (Photo by Christopher Polk/Getty Images for NARAS) ( 161027502AP00036_The_55th_A )

NEW YORK, NY - FEBRUARY 15: Musician Adam Levine attends Adam Levine Signature Fragrances Launch Event at Macy's Herald Square on February 15, 2013 in New York City. (Photo by Jamie McCarthy/Getty Images) ( 73353020 )

LOS ANGELES, CA - FEBRUARY 10: Singer Adam Levine of Maroon 5 poses with the GRAMMY Charities Signing Booth during the 55th Annual GRAMMY Awards at STAPLES Center on February 10, 2013 in Los Angeles, California. (Photo by Maury Phillips/WireImage) ( 160512187SV00003_The_55th_A )

LOS ANGELES, CA - MARCH 15: Adam Levine and Maroon 5 perform at the Staples Center on March 15, 2013 in Los Angeles, California. (Photo by Christopher Polk/Getty Images for Maroon 5) ( 73807347 )

LOS ANGELES, CA - MARCH 15: Adam Levine and Maroon 5 perform at the Staples Center on March 15, 2013 in Los Angeles, California. (Photo by Christopher Polk/Getty Images for Maroon 5) ( 73807318 )

THE TONIGHT SHOW WITH JAY LENO -- (EXCLUSIVE COVERAGE) -- Episode 4444 -- Pictured: Adam Levine takes a picture of the audience during a commercial break on April 12, 2013 -- (Photo by: Chris Haston/NBC/NBCU Photo Bank via Getty Images) ( NUP_155842_0308.jpg )

LOS ANGELES, CA - APRIL 25: Adam Levine attends NYLON Guys and ASOS celebrate April/May cover star Adam Levine at Dominick's Restaurant on April 25, 2013 in Los Angeles, California. (Photo by Mike Windle/WireImage) ( 74376602 )

NEW ORLEANS, LA - MAY 03: Lead singer Adam Levine of Maroon 5 performs during the 2013 New Orleans Jazz & Heritage Music Festival at Fair Grounds Race Course on May 3, 2013 in New Orleans, Louisiana. (Photo by Douglas Mason/Getty Images) ( 74493965 )

NEW ORLEANS, LA - MAY 03: Adam Levine of Maroon 5 performs during the 2013 New Orleans Jazz & Heritage Music Festival at Fair Grounds Race Course on May 3, 2013 in New Orleans, Louisiana. (Photo by C Flanigan/FilmMagic) ( 74498543 )

NEW ORLEANS, LA - MAY 03: Adam Levine of Maroon 5 performs during the 2013 New Orleans Jazz & Heritage Music Festival at Fair Grounds Race Course on May 3, 2013 in New Orleans, Louisiana. (Photo by C Flanigan/FilmMagic) ( 74498535 )

NEW ORLEANS, LA - MAY 03: Adam Levine of Maroon 5 performs during the 2013 New Orleans Jazz & Heritage Music Festival at Fair Grounds Race Course on May 3, 2013 in New Orleans, Louisiana. (Photo by C Flanigan/FilmMagic) ( 74498546 )

NEW ORLEANS, LA - MAY 03: Adam Levine of Maroon Five performs during the 2013 New Orleans Jazz & Heritage Music Festival at Fair Grounds Race Course on May 3, 2013 in New Orleans, Louisiana. (Photo by Erika Goldring/WireImage) ( 74499198 )

TOLUCA LAKE, CA - MAY 06: Adam Levine attends the 6th annual George Lopez celebrity golf classic & Mercedes-Benz dealer championship at Lakeside Golf Club on May 6, 2013 in Toluca Lake, California. (Photo by Tibrina Hobson/FilmMagic) ( 74530790 )

CARSON, CA - MAY 11: Singer Adam Levine of Maroon 5 performs at 102.7 KIIS FM's Wango Tango on May 11, 2013 in Carson, California. (Photo by Kevin Winter/Getty Images) ( 74614022 )

BEVERLY HILLS, CA - MAY 14: Recording artist Adam Levine onstage during BMI's 61st Annual Pop Awards at the Beverly Wilshire Four Seasons Hotel on May 14, 2013 in Beverly Hills, California. (Photo by Paul A. Hebert/Getty Images) ( 74656797 )

NEW YORK, NY - NOVEMBER 09: Musician Adam Levine of Maroon 5 performs during the 2011 Victoria's Secret Fashion Show at the Lexington Avenue Armory on November 9, 2011 in New York City. (Photo by Michael Stewart/Getty Images) ( 67258922 )

LOS ANGELES, CA - JANUARY 14: Singer Adam Levine from the musical group Maroon 5 arrives at the 16th annual Critics' Choice Movie Awards at the Hollywood Palladium on January 14, 2011 in Los Angeles, California. (Photo by Christopher Polk/Getty Images for VH1) ( 63039067 )

NBCUNIVERSAL EVENTS -- "2012 NBC Upfront Presentation" Red Carpet/Green Room roaming -- Pictured: Adam Levine "The Voice" -- (Photo by: Charles Sykes/NBC/NBCU Photo Bank via Getty Images) ( NUP_150037_0569.JPG )

NEW YORK, NY - OCTOBER 25: Singer Adam Levine enters the "Late Show With David Letterman" taping at the Ed Sullivan Theater on October 25, 2012 in New York City. (Photo by Ray Tamarra/FilmMagic) ( 72013293 )

NEW YORK, NY - JUNE 29: Singer Adam Levine of Maroon 5 performs on NBC's "Today" at Rockefeller Plaza on June 29, 2012 in New York City. (Photo by Michael Loccisano/Getty Images) ( 70397864 )

NEW YORK, NY - JULY 02: Singer / Musician / Actor Adam Levine filming on location for "Can a Song Save Your Life?" on July 2, 2012 in New York City. (Photo by Jeffrey Ufberg/WireImage) ( 70448025 )

LAS VEGAS, NV - SEPTEMBER 21: Adam Levine of Maroon 5 performs onstage during the iHeartRadio Music Festival at the MGM Grand Garden Arena on September 21, 2013 in Las Vegas, Nevada. (Photo by Christopher Polk/Getty Images for Clear Channel) ( 179684141VL00102_iHeartRadi )

CARSON, CA - MAY 11: Singer Adam Levine of Maroon 5 performs at 102.7 KIIS FM's Wango Tango on May 11, 2013 in Carson, California. (Photo by Kevin Winter/Getty Images) ( 74614026 )

LAS VEGAS, NV - SEPTEMBER 21: Adam Levine of Maroon 5 performs onstage during the iHeartRadio Music Festival at the MGM Grand Garden Arena on September 21, 2013 in Las Vegas, Nevada. (Photo by Denise Truscello/Getty Images for Clear Channel) ( 179684141VL00132_iHeartRadi )