The stars were out in full force last night at the amfar Gala at Milk Studios in L.A.

OK! GALLERY: HOLY HAIR COLORS! A LOOK BACK AT KATY PERRY THROUGH THE YEARS!

Not only did Katy Perry perform, but she bonded with her namesake: Kate Hudson! Did you know Katy was born with the same name as the Glee actress?

OK! GALLERY: KATE HUDSON AND LIEV SCHREIBER ATTEND A PHOTO CALL FOR THE RELUCTANT FUNDAMENTALIST

Also out at the hot event last night were Octavia Spencer, Lance Bass, and even a Sex and the City reunion with Sarah Jessica Parker and Kristin Davis!

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