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X17 was the only one to catch Brit last night in a car, leaving the chic Beverly Park neighborhood (where Robbie Williams just bought a house for $26 million), after having attended a Halloween party at her pal (and Palms owner) George Maloof's house.

Brit was dressed as a platinum-haired fairy -- she was with her always-scary dad (in the front seat) and her fav cousin Laura Lynn Covington, who was also dressed as a wigged-out fairy :)

Happy Halloween, Queen B!