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Chris Brown and Rihanna attend the 55th Annual GRAMMY Awards at STAPLES Center on February 10, 2013 in Los Angeles, California. (Photo by Christopher Polk/Getty Images for NARAS) ( 161404550 )

Actress Portia de Rossi, actress Ellen DeGeneres and singer Katy Perry attend the 55th Annual GRAMMY Awards at STAPLES Center on February 10, 2013 in Los Angeles, California. (Photo by Christopher Polk/Getty Images for NARAS) ( 161406940 )

Singer Kelly Rowland speaks onstage at the 55th Annual GRAMMY Awards at Staples Center on February 10, 2013 in Los Angeles, California. (Photo by Kevork Djansezian/Getty Images) ( 161412384 )

Musician Lady Gaga arrives at the 52nd Annual GRAMMY Awards held at Staples Center on January 31, 2010 in Los Angeles, California. (Photo by Jason Merritt/Getty Images)

Nicki Minaj attends the 53rd Annual GRAMMY Awards at the Staples Center, February 13, 2011 in Los Angeles, California. (Photo by fafotos/ep/PictureGroup) via AP IMAGES

Kimbia arrives to the 55th Annual Grammy Awards at Staples Center in Los Angeles, California on February 10, 2013. (Michael Owen Baker, staff photographer) ( 55th Annual Grammy Awards )

Fergie at the 54th annual Grammy Awards in Los Angeles. CBS has issued a memo to Grammy Awards attendees against baring too much skin at the ceremony Sunday. The network requests that 'buttocks and female breasts are adequately covered'' for the televised award show. The memo sent out Wednesday, Feb. 6, 2013, also warned against 'see-through clothing,' exposure of 'the genital region' and said that 'thong type costumes are problematic. (AP Photo/Chris Pizzello)

Singer Robyn 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)

Singer Katy Perry arrives at the 51st Annual Grammy Awards held at the Staples Center on February 8, 2009 in Los Angeles, California. (Photo by Frazer Harrison/Getty Images)

Singer Katy Perry arrives at the 55th Annual GRAMMY Awards at Staples Center on February 10, 2013 in Los Angeles, California. (Photo by Jason Merritt/Getty Images) ( 161402574 )

Singer Rihanna arrives at the 55th annual Grammy Awards in Los Angeles, California February 10, 2013. REUTERS/Mario Anzuoni ( MUSIC-GRAMMYS/ )

Singer Rihanna arrives at the 55th Annual GRAMMY Awards at Staples Center on February 10, 2013 in Los Angeles, California. (Photo by Jason Merritt/Getty Images) ( 161400731 )

Napone arrives to the 55th Annual Grammy Awards at Staples Center in Los Angeles, California on February 10, 2013. (Michael Owen Baker, staff photographer) ( 55th Annual Grammy Awards )

Red Foo arrives to the 55th Annual Grammy Awards at Staples Center in Los Angeles, California on February 10, 2013. (Michael Owen Baker, staff photographer) ( 55th Annual Grammy Awards )

Esperanza Spalding accepts the Best New Artist Award at The 53rd Annual GRAMMY Awards held at Staples Center on February 13, 2011 in Los Angeles, California. (Photo by Larry Busacca/Getty Images For The Recording Academy)

Comedian Margaret Cho arrives at the 46th Annual Grammy Awards held at the Staples Center on February 8, 2004 in Los Angeles, California. (Photo by Kevin Winter/Getty Images)

Actress Teri Hatcher arrives at the 48th Annual Grammy Awards at the Staples Center on February 8, 2006 in Los Angeles, California. (Photo by Stephen Shugerman/Getty Images)

Singer M.I.A. speaks during the 51st Annual Grammy Awards held at the Staples Center on February 8, 2009 in Los Angeles, California. (Photo by Kevin Winter/Getty Images)

Musicians Gavin Rossdale and wife Gwen Stefani arrive at the 48th Annual Grammy Awards at the Staples Center on February 8, 2006 in Los Angeles, California. (Photo by Stephen Shugerman/Getty Images)

Christina Aguilera poses as she arrives at the 43rd annual Grammy Awards Wednesday, Feb. 21, 2001, at the Staples Center in Los Angeles. Aguilera is nominated for best latin pop album and best female pop vocal performance. (AP Photo/Micahel Caulfield)

Singer Rihanna arrives at The 53rd Annual GRAMMY Awards held at Staples Center on February 13, 2011 in Los Angeles, California. (Photo by Jason Merritt/Getty Images)

Singer Natasha Bedingfield arrives at the 50th Grammy Awards in Los Angeles on February 10, 2008. AFP PHOTO/Gabriel BOUYS

Nicole Scherzinger of the Pussy Cat Dolls arrives for the 49th Annual Grammy Awards on Sunday, Feb. 11, 2007, in Los Angeles. (AP Photo/Matt Sayles)

Singer Keri Hilson arrives at the 52nd Annual GRAMMY Awards held at Staples Center on January 31, 2010 in Los Angeles, California. (Photo by Larry Busacca/Getty Images for NARAS)

Taylor Swift arrives at the 54th annual Grammy Awards on Sunday, Feb. 12, 2012 in Los Angeles. (AP Photo/Chris Pizzello)

Taylor Swift poses backstage with the awards for best country song and best country solo performance for "Mean" at the 54th annual Grammy Awards, Monday, Feb. 13, 2012, in Los Angeles. (AP Photo/Mark J. Terrill)

Singer Beyonce Knowles arrives to the 47th Annual Grammy Awards at the Staples Center on February 13, 2005 in Los Angeles, California. (Photo by Kevin Winter/Getty Images)

Singer Beyonce Knowles arrives to the 47th Annual Grammy Awards at the Staples Center on February 13, 2005 in Los Angeles, California. (Photo by Kevin Winter/Getty Images)

Rihanna arrives at the 54th annual Grammy Awards on Sunday, Feb. 12, 2012 in Los Angeles. (AP Photo/Chris Pizzello)

Presenters Stevie Wonder and Alicia Keys present the Best Female Pop Vocal Performance winner during the 48th Annual Grammy Awards 08 February 2006 at the Staples Center in Los Angeles. AFP PHOTO/Timothy A. CLARY

Jennifer Lopez, perhaps the evening's most-talked-about celebrity with a gown cut in a loose V that left little to the imagination, appears on-stage during the 42nd Grammy Awards at the Staples Center in Los Angeles, Wednesday, Feb. 23, 2000. (AP Photo/Kevork Djansezian).

Sean "Puffy" Combs and singer Jennifer Lopez pose backstage at the 42nd Grammy Awards in Los Angeles, Wednesday, Feb. 23, 2000. (AP Photo/Reed Saxon)