Kelly Osbourne, Kourtney and Kim Kardashian, Katy Perry. Photos: PA/Getty Images
See which other stars made the guestlist and let us know who you think was best dressed in our round-up from the Aids Foundation party below.
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- Anna Paquin in Pucci

- Kim Kardashian in Alaia

- Kourtney Kardashian in Raoul

- Gwen Stefani in Zuhair Murad

- Kelly Osbourne

- Katy Perry in Blumarine

- Alessandra Ambrosio in Roberto Cavalli

- Elton John and David Furnish

- Bar Refaeli in Roberto Cavalli

- Brooklyn Decker in Valentino

- Carmen Electra

- Chace Crawford in Emporio Armani

- Dianna Agron in Carolina Herrera

- Dita Von Teese

- Karolina Kurkova

- Michelle Rodriguez

- Miley Cyrus in Roberto Cavalli

- Natasha Bedingfield

- Paz Vega

- Rose McGowan in Paul Ka

- Terri Seymour

- Mischa Barton in Temperley

- Heidi Klum in Versace

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