Alessandra Ambrosio was two months pregnant on Victoria's Secret catwalk

Alessandra Ambrosio was two months pregnant when she took to the catwalk to tape the Victoria's Secret Fashion Show at the beginning of November (11) - and no one knew.

The sexy supermodel reveals she considered pulling out of the project, but instead decided not to tell anyone she was expecting - and hope producers didn't notice she was a little heavier.

Ambrosio, who revealed she was pregnant on Tuesday (27Dec11), tells UsMagazine.com, "When I first found out I was pregnant I thought, 'Oh my gosh, I don't think I'm going to be able to walk on the show,' and I didn't tell anybody so no one knew at the show that I was pregnant.

"A week before, I told my booker, 'I don't think I'm going to be able to fit into the clothes because I gained a few pounds already!', but we were just quiet. I cut all the sugars and sweets 10 days before and I got my trainer... and we were doing lots of glutes and arms and back exercises."