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It was tough to keep the baby secret -- Beyonce

IT'S tough to keep a pregnancy a secret when you are in the public eye and, for a while, Beyonce thought the jig was up.

"The whole time I definitely was thinking, 'Everyone knows, everyone can see'," said the singer before the screening of her new concert DVD yesterday in New York.

It became difficult for her to hide the baby bump when the Grammy-winner performed to sold-out crowds at New York's Roseland Theater in August.

"When you're pregnant, it's a little bit harder to breathe, so it was hard doing all the choreography and singing at the same time," said the 30-year-old singer.

Along with classics from her Destiny's Child days and major hits from her solo career, the Live At Roseland DVD includes interviews with the singer, home footage of rehearsals and special family moments -- even shots of Beyonce in a wedding gown.

She's also hoping the film will serve as a time capsule for her unborn child, a chance for him or her to say "I can't believe I was in that belly", she said.