12 Worst Dressed Stars of 2012

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Kelly Osbourne

at the Gerlan Jeans fashion show in NYC; at the Chris Benz fashion show in NYC; at the Victoria's Secret suite at the Empire Hotel in NYC.

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Kat Graham

at Variety's Power of Youth event in Hollywood; at a Bing and DoSomething.org event in NYC; at the Soul Train Awards in Las Vegas.

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Elle Fanning

at the 17th Annual Critics' Choice Movie Awards in L.A.; at the Ginger & Rosa premiere in Toronto, Canada; at the 56th BFI London Film Festival in England.

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Aubrey O'Day

at the Hard Rock Hotel and Casino in Las Vegas; at the launch of Chill at W Los Angeles in Calif.; at the launch of Glamhouse.com in L.A.

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Rita Ora

outside BBC Maida Vale in London; at the MOBO Awards in Liverpool, England; leaving BBC Radio 1 studios in London.

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Helena Bonham Carter

at the Orange British Academy Film Awards in London; at an investiture ceremony at Buckingham Palace in London; at the Dark Shadows premiere in London.

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Lady Gaga

leaving her hotel in London; arriving at the Ritz Carlton in Hong Kong, China; arriving at her hotel in London.

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Chloe Sevigny

at the Costume Institute Gala in NYC; at the Jeffrey Fashion Cares event in NYC; at the American Horror Story: Asylum premiere in L.A.

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Big Ang

doing a photo shoot in Staten Island, New York; promoting her show at Trattoria Dopo Teatro in NYC; at the Point Foundation's 5th Annual Gala in NYC.

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Florence Welch

at the Women's Tales premiere in Venice, Italy; at the Costume Institute Gala in NYC; at the NME Awards in London.

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Carly Rae Jepsen

at Arthur Ashe Kids' Day in NYC; at MTV Spring Break in Las Vegas; leaving BBC Radio 1 studios in London.