PHOTOS: Past Grammy Looks Too Risque for New 'Dress Code'

(Reuters)

Lady Gaga performs "Poker Face" at the start of the 52nd annual Grammy Awards in Los Angeles on January 31, 2010. (Reuters)

Lady Gaga performs her new song "Born This Way" at the 53rd annual Grammy Awards in Los Angeles on February 13, 2011 (Reuters)

Actress and singer Christina Milian arrives at the 48th annual Grammy Awards in Los Angeles on February 8, 2006. (Reuters)

Singers Pink, Christina Aguilera and Mya pose with their awards at the 44th annual Grammy Awards on February 27, 2002 in Los Angeles. (Reuters)

Toni Braxton poses with her Grammy for Best Female R&B Vocal Performance at the 43rd annual Grammy Awards on February 21, 2001 in Los Angeles. (Reuters)

Rapper Sisqo (right) and his girlfriend Tara arrive at the 43rd annual Grammy Awards in Los Angeles on February 21, 2001. (Reuters)

Destiny's Child is shown with the Grammys they won for Best R&B Performance by a Duo or Group With Vocal and for Best R&B Song at the 43rd annual Grammy Awards in Los Angeles on February 21, 2001. (Reuters)

Mya poses for photographers backstage at the 43rd annual Grammy Awards on February 21, 2001 in Los Angeles. (Reuters)

Jennifer Lopez poses backstage with Sean "Puffy" Combs at the 42nd annual Grammy Awards in Los Angeles on February 23, 2000. (Reuters)

Singer Rihanna poses in an outfit designed by Jean Paul Gaultier upon arrival at the 53rd annual Grammy Awards on February 13, 2011. (Reuters)

Drake and Rihanna perform "What's My Name" at the 53rd annual Grammy Awards. (Reuters)

Rihanna arrives at the 54th annual Grammy Awards in Los Angeles on February 12, 2012. (Reuters)

Pink performs "Glitter in the Air" at the 52nd annual Grammy Awards in Los Angeles on January 31, 2010. (Reuters)

M.I.A. performs at the 51st annual Grammy Awards in Los Angeles February 8, 2009. (Reuters)

Russian singer Nadeea arrives on the red carpet at the 52nd annual Grammy Awards in Los Angeles on January 31, 2010. (Reuters)

Nadeea arrives at the 54th annual Grammy Awards in Los Angeles on February 12, 2012. (Reuters)

Fergie of The Black Eyed Peas arrives at the 54th annual Grammy Awards in Los Angeles on February 12, 2012. (Reuters)