Britney Spears wedding began as a joke

The 22-year-old pop star married Jason Allen Alexander of Kentwood, La., about 5:30 a.m. Saturday at a Las Vegas wedding chapel, said George Maloof Jr., owner and operator of the Palms Casino Hotel.

"Nobody knew it was coming," said Maloof, Spears' good friend.

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But the couple arranged an annulment Saturday afternoon in the presence of several people, including a Las Vegas lawyer, said a source close to Spears who spoke on condition of anonymity. The signed annulment will be filed when the courts open Monday morning, the source said.