Leighton Meester performed at Haze Nightclub in Las Vegas on Saturday looking hot in a blue and white minidress and peep-toe platform shoes. Yummy!

Earlier this year, Leighton and her "Gossip Girl" co-star Ed Westwick caused havoc in New York City after their foul-mouthed outbursts allegedly prompted complaints from fellow diners. According to New York gossip column PageSix, the actress continually cursed loudly and snapped at one man who asked her to restrict her bad language.

Leighton is dating actor Sebastian Stan, who she met on the set of the hit teen drama in 2007, but the actress doesn't believe in marriage. She told Glamour magazine, "It's not for me. I believe in love, children and being a good person. I wouldn't mind living together (but) eventually I'll have to get a separate house for my shoes!" 

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