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Britney Spears is not engaged to her longtime agent Jason Trawick, a source close to the singer tells

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"This is absolutely not true," the source tells Us. "Britney is not engaged."

The tabloid Star reported Wednesday that Trawick proposed while the two were vacationing in the Bahamas last month, and that the pop star is thinking about a December wedding after her Circus tour ends.

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A source told the magazine: "He didn't exactly get down on one knee, but Brit didnt care. She said yes, and they opened a bottle of champagne to celebrate. Jason held Britney for a long time and kissed her cheeks. They talked about their future for hours and didnt go to sleep until after 3 a.m.! They just wanted to be alone together."

See photos of Britney on the Circus tour!

Her rep could not be reached for comment.