Britney drinking in Vegas?

Britney Spears has been spotted drinking alcoholic cocktails - casting doubt on speculation she is pregnant. The star has been at the centre of pregnancy rumours since she was photographed sporting an apparent baby bump during a recent holiday in Hawaii. But this week, the singer was seen sipping a Cosmopolitan beverage as she celebrated husband Kevin Federline's 28th birthday in Las Vegas. The pair, who have a baby son, Sean Preston, reportedly looked besotted with each other as they partied at the Pure nightclub - despite claims their marriage is on the rocks. Sources claim the couple were seen holding hands and kissing as they lounged on a white bed in the club. Britney was said to be 'draping herself all over Kevin', according to America's New York Daily News newspaper. [MandC] Thanks to JJB for pics!