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2012 Kennedy Center Honoree David Letterman, and his wife, Regina, arrive at the Kennedy Center for the Performing Arts for the 2012 Kennedy Center Honors Performance and Gala Sunday, Dec. 2, 2012 at the State Department in Washington. (AP Photo/Kevin Wolf)

Rock band Led Zeppelin, from left, keyboardist/bassist John Paul Jones, singer Robert Plant, guitarist Jimmy Page, stand as the Star Spangled Banner is played during the Kennedy Center Honors Gala at the Kennedy Center in Washington, Sunday, Dec. 2, 2012. While Led Zeppelin is being honored as a band, surviving members Jones, Page, and Plant, each received the Kennedy Center Honors. (AP Photo/Manuel Balce Ceneta)

President Barack Obama, right, and first lady Michelle Obama, second from right, with the 2012 Kennedy Center Honors recipients, ballerina Natalia Makarova, left, and actor and director Dustin Hoffman, stand as the National Anthem is played during the Kennedy Center Honors Gala at the Kennedy Center in Washington, Sunday, Dec. 2, 2012. (AP Photo/Manuel Balce Ceneta)

2012 Kennedy Center Honorees and members of the band Led Zeppelin, from left, Jimmy Page, John Paul Jones, and Robert Plant chat on the red carpet after arriving at the Kennedy Center for the Performing Arts for the 2012 Kennedy Center Honors Performance and Gala Sunday, Dec. 2, 2012 at the State Department in Washington. (AP Photo/Kevin Wolf)

Members of Led Zeppelin are pictured on the balcony of the Kennedy Center as 2012 honorees in Washington, December 2, 2012. (L-R) John Paul Jones, Robert Plant and Jimmy Page were among seven who were honored this year. REUTERS/Jason Reed

US President Barack Obama kisses Toby Perlman while arriving with US First Lady Michelle Obama during an event in the East Room of the White House December 2, 2012 in Washington, DC. Obama and US first lady Michelle Obama attended the event at the White House with the 2012 Kennedy Center Honorees before to celebrate their contribution to the arts before heading to the Kennedy Center for the honors program. BRENDAN SMIALOWSKI/AFP/Getty Images

Kennedy Center honorees (L-R) Led Zeppelin band member Jimmy Page, late-night TV host David Letterman and blues musician George "Buddy" Guy appear on the balcony as they attend the 2012 Kennedy Center Honors at the Kennedy Center in Washington, December 2, 2012. REUTERS/Jason Reed

US First Lady Michelle Obama and US President Barack Obama arrive during an event in the East Room of the White House December 2, 2012 in Washington, DC. Obama and US first lady Michelle Obama attended the event at the White House with the 2012 Kennedy Center Honorees before to celebrate their contribution to the arts before heading to the Kennedy Center for the honors program. BRENDAN SMIALOWSKI/AFP/Getty Images

WASHINGTON - DECEMBER 2: (AFP OUT) Musician Jeff Beck arrives at the Kennedy Center Honors reception at the White House on December 2, 2012 in Washington, DC. The Kennedy Center Honors recognized seven individuals - Buddy Guy, Dustin Hoffman, David Letterman, Natalia Makarova, John Paul Jones, Jimmy Page, and Robert Plant - for their lifetime contributions to American culture through the performing arts. (Photo by Brendan Hoffman/Getty Images)

WASHINGTON - DECEMBER 2: (AFP OUT) Musician Buddy Guy attends the Kennedy Center Honors reception at the White House on December 2, 2012 in Washington, DC. The Kennedy Center Honors recognized seven individuals - Buddy Guy, Dustin Hoffman, David Letterman, Natalia Makarova, John Paul Jones, Jimmy Page, and Robert Plant - for their lifetime contributions to American culture through the performing arts. (Photo by Brendan Hoffman/Getty Images)

2012 Kennedy Center Honorees and members of the band Led Zeppelin, from left, Jimmy Page, John Paul Jones, and Robert Plant chat on the red carpet after arriving at the Kennedy Center for the Performing Arts for the 2012 Kennedy Center Honors Performance and Gala Sunday, Dec. 2, 2012 at the State Department in Washington. (AP Photo/Kevin Wolf)

Late-night TV talk show host David Letterman is pictured on the balcony at the 2012 Kennedy Center Honors at the Kennedy Center in Washington, December 2, 2012. Letterman was one of seven honorees of the 2012 event. REUTERS/Jason Reed

U.S. first lady Michelle Obama (R) embraces 2012 Kennedy Center honoree, actor Dustin Hoffman at the Kennedy Center in Washington, December 2, 2012. REUTERS/Jason Reed

U.S. President Barack Obama and first lady Michelle Obama applaud on the balcony as they attend the 2012 Kennedy Center Honors at the Kennedy Center in Washington, December 2, 2012. REUTERS/Jason Reed

US President Barack Obama and US First Lady Michelle Obama arrive for the 2012 Kennedy Center Honors at the Kennedy Center December 2, 2012 in Washington, DC. Robert Plant of Led Zeppelin, Jimmy Page of Led Zeppelin, John Paul Jones of Led Zeppelin, ballerina Natalia Makarova, comedian and late night talk show host David Letterman, actor Dustin Hoffman and Blues musician Buddy Guy were each honored for their lifetime contributions to the arts. BRENDAN SMIALOWSKI/AFP/Getty Images

Kennedy Center Honoree comedian and late night talk show host David Letterman arrives for an event in the East Room of the White House December 2, 2012 in Washington, DC. Obama and US First Lady Michelle Obama attended the event at the White House with the 2012 Kennedy Center Honorees before to celebrate their contribution to the arts before heading to the Kennedy Center for the honors program. BRENDAN SMIALOWSKI/AFP/Getty Images

WASHINGTON - DECEMBER 2: (AFP OUT) U.S. President Barack Obama and first lady Michelle Obama (C) attend the Kennedy Center Honors at the Kennedy Center on December 2, 2012 in Washington, DC. The Kennedy Center Honors recognized seven individuals - Buddy Guy, Dustin Hoffman, David Letterman, Natalia Makarova, John Paul Jones, Jimmy Page, and Robert Plant - for their lifetime contributions to American culture through the performing arts. (Photo by Brendan Hoffman/Getty Images)

Kennedy Center Honoree actor Dustin Hoffman arrives for an event in the East Room of the White House December 2, 2012 in Washington, DC. Obama and US First Lady Michelle Obama attended the event at the White House with the 2012 Kennedy Center Honorees before to celebrate their contribution to the arts before heading to the Kennedy Center for the honors program. BRENDAN SMIALOWSKI/AFP/Getty Images

Actor Morgan Freeman listens during an event in the East Room of the White House December 2, 2012 in Washington, DC. Obama and US First Lady Michelle Obama attended the event at the White House with the 2012 Kennedy Center Honorees before to celebrate their contribution to the arts before heading to the Kennedy Center for the honors program. BRENDAN SMIALOWSKI/AFP/Getty Images

US First Lady Michelle Obama and US President Barack Obama and others listen to the US national anthem during the 2012 Kennedy Center Honors at the Kennedy Center December 2, 2012 in Washington, DC. Robert Plant of Led Zeppelin, Jimmy Page of Led Zeppelin, John Paul Jones of Led Zeppelin, ballerina Natalia Makarova, comedian and late night talk show host David Letterman, actor Dustin Hoffman and Blues musician Buddy Guy were each honored for their lifetime contributions to the arts. BRENDAN SMIALOWSKI/AFP/Getty Images

Kennedy Center Honoree Dustin Hoffman arrives with his wife, Lisa, at the Kennedy Center for the Performing Arts for the 2012 Kennedy Center Honors Performance and Gala Sunday, Dec. 2, 2012 at the State Department in Washington. (AP Photo/Kevin Wolf)

WASHINGTON - DECEMBER 2: (AFP OUT) Comedian David Letterman (L) and actor Dustin Hoffman attend the Kennedy Center Honors reception at the White House on December 2, 2012 in Washington, DC. The Kennedy Center Honors recognized seven individuals - Buddy Guy, Dustin Hoffman, David Letterman, Natalia Makarova, John Paul Jones, Jimmy Page, and Robert Plant - for their lifetime contributions to American culture through the performing arts. (Photo by Brendan Hoffman/Getty Images)

WASHINGTON - DECEMBER 2: (AFP OUT) Musician Lenny Kravitz attends at the Kennedy Center Honors reception at the White House on December 2, 2012 in Washington, DC. The Kennedy Center Honors recognized seven individuals - Buddy Guy, Dustin Hoffman, David Letterman, Natalia Makarova, John Paul Jones, Jimmy Page, and Robert Plant - for their lifetime contributions to American culture through the performing arts. (Photo by Brendan Hoffman/Getty Images)

WASHINGTON - DECEMBER 2: (AFP OUT) President Barack Obama delivers remarks at the Kennedy Center Honors reception at the White House on December 2, 2012 in Washington, DC. The Kennedy Center Honors recognized seven individuals - Buddy Guy, Dustin Hoffman, David Letterman, Natalia Makarova, John Paul Jones, Jimmy Page, and Robert Plant - for their lifetime contributions to American culture through the performing arts. (Photo by Brendan Hoffman/Getty Images)

WASHINGTON - DECEMBER 2: (AFP OUT) Comedian David Letterman kisses the hand of ballerina Natalia Makarova (L) as President Barack Obama (R) looks on at the Kennedy Center Honors reception at the White House on December 2, 2012 in Washington, DC. The Kennedy Center Honors recognized seven individuals - Buddy Guy, Dustin Hoffman, David Letterman, Natalia Makarova, John Paul Jones, Jimmy Page, and Robert Plant - for their lifetime contributions to American culture through the performing arts. (Photo by Brendan Hoffman/Getty Images)

WASHINGTON - DECEMBER 2: (AFP OUT) Recipients of the Kennedy Center Honors attend a reception at the White House on December 2, 2012 in Washington, DC. The Kennedy Center Honors recognized seven individuals - Buddy Guy, Dustin Hoffman, David Letterman, Natalia Makarova, John Paul Jones, Jimmy Page, and Robert Plant - for their lifetime contributions to American culture through the performing arts. (Photo by Brendan Hoffman/Getty Images)

WASHINGTON - DECEMBER 2: (AFP OUT) Ballerina Natalia Makarova, Comedian David Letterman, and actor Dustin Hoffman (L-R) attend the Kennedy Center Honors reception at the White House on December 2, 2012 in Washington, DC. The Kennedy Center Honors recognized seven individuals - Buddy Guy, Dustin Hoffman, David Letterman, Natalia Makarova, John Paul Jones, Jimmy Page, and Robert Plant - for their lifetime contributions to American culture through the performing arts. (Photo by Brendan Hoffman/Getty Images)

WASHINGTON - DECEMBER 2: (AFP OUT) Comedian Jimmy Kimmel departs the Kennedy Center Honors reception at the White House on December 2, 2012 in Washington, DC. The Kennedy Center Honors recognized seven individuals - Buddy Guy, Dustin Hoffman, David Letterman, Natalia Makarova, John Paul Jones, Jimmy Page, and Robert Plant - for their lifetime contributions to American culture through the performing arts. (Photo by Brendan Hoffman/Getty Images)

WASHINGTON - DECEMBER 2: (AFP OUT) President Barack Obama delivers remarks at the Kennedy Center Honors reception at the White House on December 2, 2012 in Washington, DC. The Kennedy Center Honors recognized seven individuals - Buddy Guy, Dustin Hoffman, David Letterman, Natalia Makarova, John Paul Jones, Jimmy Page, and Robert Plant - for their lifetime contributions to American culture through the performing arts. (Photo by Brendan Hoffman/Getty Images)

(L-R) Led Zeppelin band members Robert Plant, Jimmy Page, John Paul Jones listen during an event in the East Room of the White House December 2, 2012 in Washington, DC. US President Barack Obama and First Lady Michelle Obama attended the event at the White House with the 2012 Kennedy Center Honorees to celebrate their contribution to the arts before heading to the Kennedy Center for the honors program. BRENDAN SMIALOWSKI/AFP/Getty Images

Singer Aretha Franklin arrives for an event in the East Room of the White House December 2, 2012 in Washington, DC. US President Barack Obama and First Lady Michelle Obama attended the event at the White House with the 2012 Kennedy Center Honorees to celebrate their contribution to the arts before heading to the Kennedy Center for the honors program. BRENDAN SMIALOWSKI/AFP/Getty Images

President Barack Obama is applauded by the 2012 Kennedy Center Honors recipients, from left, rock band Led Zeppelin singer Robert Plant, guitarist Jimmy Page, and keyboardist/bassist John Paul Jones, ballerina Natalia Makarova and comedian and television host David Letterman, at the conclusion of a reception hosted by President Barack Obama and first lady Michelle Obama for the honorees in the East Room of the White House in Washington, Sunday, Dec. 2, 2012. While Led Zeppelin is being honored as a band, surviving members John Paul Jones, Jimmy Page, and Robert Plant, each received the Kennedy Center Honors. (AP Photo/Manuel Balce Ceneta)

Actor Dustin Hoffman leaves after an event in the East Room of the White House on December 2, 2012 in Washington. Obama and US first lady Michelle Obama attended the event at the White House with the 2012 Kennedy Center Honorees to celebrate their contribution to the arts before heading to the Kennedy Center for the honors program. BRENDAN SMIALOWSKI/AFP/Getty Images

Comedian Stephen Colbert and wife, Evelyn Colbert, arrive at the Kennedy Center for the Performing Arts for the 2012 Kennedy Center Honors Performance and Gala Sunday, Dec. 2, 2012 at the State Department in Washington. (AP Photo/Kevin Wolf)

Actress Tina Fey arrives at the Kennedy Center for the Performing Arts for the 2012 Kennedy Center Honors Performance and Gala Sunday, Dec. 2, 2012 at the State Department in Washington. (AP Photo/Kevin Wolf)

Singer Tracy Chapman arrives at the Kennedy Center for the Performing Arts for the 2012 Kennedy Center Honors Performance and Gala Sunday, Dec. 2, 2012 at the State Department in Washington. (AP Photo/Kevin Wolf)

Actor Alec Baldwin and wife, Hilaria, arrive at the Kennedy Center for the Performing Arts for the 2012 Kennedy Center Honors Performance and Gala, Sunday, Dec. 2, 2012 at the State Department in Washington. (AP Photo/Kevin Wolf)

WASHINGTON, DC - DECEMBER 1: (L-R Back Row) John Paul Jones, Jimmy Page, Robert Plant, David Letterman (L-R Front Row) U.S. Secretary of State Hillary Rodham Clinton, Buddy Guy, Natalia Makarova, Dustin Hoffman pose following a dinner for Kennedy honorees hosted by U.S. Secretary of State Hillary Rodham Clinton at the U.S. Department of State on December 1, 2012 in Washington, DC. (Photo by Ron Sachs - Pool/Getty Images)

Blues musician Buddy Guy (C) and guests arrive at the 2012 Kennedy Center Honorees held at the Kennedy Center Hall of States in Washington, DC, Sunday, December 2, 2012. AFP PHOTO / Drew ANGERERDrew Angerer/AFP/Getty Images