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Benny Medina - Nicole Richie's manager, among others - sure knows how to entertain! The Hilton sisters, along with gal pal Kimberly Stewart (whose posh hair has been that way for a while, folks!), started off their Friday evening at Villa off Melrose before heading over to Benny's big bash. And check out who else attended below!

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Ashley Olsen, who didn't want to be seen - maybe because the controversy surrounding her sis?

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Guess Mischa's back from Sundance finally!

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And it looks like she was so excited to be out of the cold weather that she decided to go braless! Cover up, Mischa - especially when you're wearing a see-through top!