Britney Spears growing belly sparks speculation she is pregnant

Britney Spears has sparked speculation she is pregnant - after she was pictured with a bulging stomach.

The pop babe, who has made no secret of her desire to start a family with second husband Kevin Federline, was snapped in a figure-hugging white top, which showed off her growing belly.

An onlooker said: "Britney normally looks so trim, but made no attempt to hide her big belly. She is either having a baby or she has been tucking into too many burgers and fries.

Earlier this year, Britney sparked rumours she was expecting her first child after she bought a maternity swimming costume.

The sexy singer reportedly ordered the garment from exclusive Los Angeles boutique Babystyle and then asked staff if there were any shops nearby for expectant mothers.

Shopper Jenny Dyke, who was in the store, said at the time: "She spent 20 minutes in the changing rooms. I don't know why anybody would want to try on clothes for pregnant women unless they are expecting themselves."

Britney recently admitted she was desperate to have a baby since marrying Kevin - who has two children with ex-girlfriend Shar Jackson - last September, saying she wanted to be a young mother.

She said: "A lot of people think you should wait till you're older to have kids. I've had a career since I was 16, I have travelled the world and even kissed Madonna!

The only thing I haven't done so far is experience the closest thing to God and that's having a baby. I can't wait!"

Britney's spokesperson said he had no idea whether she was pregnant or not.