Pop star Britney Spears is pregnant with her second child, according to media reports in the US. The 24-year-old singer had been the subject of much speculation after she was photographed on a Hawaiian holiday earlier this year (06) revealing a tummy bulge. According to American publication Us Weekly, sources close to the singer have confirmed that she is expecting a second child with husband Kevin Federline. The publications claims Spears has known she was expecting since early February (06), but waited to officially tell her family about the baby until Easter (16APR06). Spears and Federline have been married since September 2004 and have a seven-month-old child, Sean Preston. The TOXIC singer was spotted at Caesar's Palace in Las Vegas, Nevada, over the weekend (ends23APR06) sporting a red bikini and her baby bump.