Pop star Britney Spears is pregnant with her second child by husband Kevin Federline, US Weekly reported Tuesday.

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Spears, 24, was seen by the pool at Caesar's Palace in Las Vegas last weekend, sporting a red bikini and "a serious bump," the magazine said on its Web site.

Sources confirmed the pregnancy, US Weekly said.

The couple married in September 2004 and have a son, Sean, who is 7-months-old.

Federline has a daughter, Kori, 3, and a 21-month-old son, Caleb, from a previous relationship.