Rihanna, Christina Aguilera, Beyonc: 15 most daring Grammy outfits

The annual 56th Grammy Awards are set to take place Sunday night (February 10), and stars such as Rihanna and Taylor Swift have reportedly been warned against wearing outfits that "expose bare flesh" at the bash.

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An alleged email leaked by broadcaster CBS has banned "problematic" outfits exposing "female breasts", "buttock crack" and "the genital region" at the ceremony at Staples Centre in Los Angeles.

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We take a look back at some of the most flesh-baring, scantily-clad stars who've graced the Grammy red carpet over the years - from Jennifer Lopez's infamous sheer Versace gown to Beyonc's near derriere baring.

Fergie wore an orange lace Jean Paul Gaultier dress which revealed her black underwear at the Grammy Awards last year.

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