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Steve Granitz/WireImage
Rihanna
In Tom Ford.
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Jordan Strauss/Invision/AP
Gwyneth Paltrow
In Tom Ford.
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Jordan Strauss/Invision/AP
Miley Cyrus
In Tom Ford.
4/16
Jason Merritt/Getty Images for amfAR
Kristin Davis
In Monique Lhuillier.
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Jonathan Leibson/Getty Images for FIJI
Ashley Madekwe
In Giorgio Armani.
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Jon Kopaloff/FilmMagic
Alessandra Ambrosio
In Zuhair Murad.
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Jonathan Leibson/Getty Images for FIJI
Kelly Osbourne
In a white cocktail dress featuring a sheer overlay.
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Jordan Strauss/Invision/AP
Michelle Rodriguez
In The 2nd Skin Co.
9/16
Jason Merritt/Getty Images for amfAR
Lea Michele
In Versace.
10/16
Jason Kempin/Getty Images
Milla Jovovich
In Donna Karan.
11/16
Jason Kempin/Getty Images
Kat Dennings & Beth Behrs
Dennings dons a gown by designer Rubin Singer. Behrs wears Patricia Bonaldi.
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Jordan Strauss/Invision/AP
Camilla Belle
In Carolina Herrera.
13/16
Jason Kempin/Getty Images
Rose McGowan
In a black-and-white gown with keyhole cutout.
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Jordan Strauss/Invision/AP
Dita Von Teese
In Ulyana Sergeenko Couture.
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Jordan Strauss/Invision/AP
January Jones
In Tom Ford.
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Steve Granitz/WireImage
Molly Sims
In a sequined black gown.