Katy Perry and Justin Bieber pose for photos at Perez Hilton’s party after they left the Kids Choice Awards.

Look out! Mel B is ready to whip someone!

Paula Abdul attends Perez Hilton’s birthday party at Paramount Studios in Hollywood.

The Bachelor Jake Pavelka and his fiance Vienna Girardi get close on the red carpet.

Nick Carpenter and Bridget Marquardt attend Perez Hilton’s birthday bash.

Photographer Kurt Iswarienko and actress Shannon Doherty pose on the red carpet.

Kim Zolciak and Perez Hilton pose for a pic together at Perez’s birthday bash.

Perez Hilton and Liza Minnelli are all smiles at the birthday bash.