Britney Spears Smooches Student, Declares 'I'm a Brainiac!'

College student Matt Encinias, 21, an extra on Spears' latest video, told the magazine that Spears invited him and some of the other video extras to a late-night private pool party at the Standard Hotel in Los Angeles.

Spears, 25, who reportedly was drinking with the gang, then encouraged everyone to play topless truth or dare ... and Encinias ended up locking lips with the pop star.

"Britney was the first one to undress, and then everyone else followed. I turned around and saw that she was topless and she had fake tattoos of flowers on her nipples from the shoot," he said. "I was told all she wanted to do that night was kiss a boy, and that's what she did. Mission accomplished."

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