The Hills’ Audrina Patridge is the perfect lulabye hosting her Halloween bash “I Dream of Audrina” at Dusk Nightclub in Atlantic City, NJ.

Her Royal Highness, Holly Madison, held court at Studio 54 in Las Vegas, looking like she hit the self tanner a little too hard!

AnnaLynne McCord never missed a chance to show some skin! The 90210 star was scantily clad in a sexy Batman-esque costume as she partied it up in Vegas.

Kellan Lutz, Ashley’s co-host and co-star, played the part of Batman’s wingman Robin!

Ashley Greene was peacock pretty, hosting a bash at Tao in Las Vegas, in this feather fabulous getup!

Nicky Hilton was classily clever, conservatively dressed as the late actress Audrey Hepburn, at a party she hosted at Pure Nightclub in Las Vegas.

Nick Cannon and Mariah Carey were angelic, in matching his and hers costumes, at a party in New York City.

Christina Ricci and her beau Curtis Buchanan mime their newfound love in Miami, where the pair have been cavorting in swimsuits on the beach.