Fisher 'hid pregnancy' during film shoot

Isla Fisher reportedly concealed her pregnancy during the filming of Burke and Hare.

According to the Daily Mail, the Australian actress hid the fact that she was pregnant from co-stars Simon Pegg and Andy Serkis, as well as director John Landis.

Rumours had surfaced in the summer that Fisher was expecting a child with comedian Sacha Baron Cohen, but the pair did not confirm the pregnancy until after she gave birth.

Fisher also swapped her costumes for her own wardrobe. She said: "I used to pretend I was wearing a corset and then not wear it, just wear a push-up bra - don't tell the director that."

Pegg revealed that he didn't realise Fisher was pregnant during filming, adding: "I didn't know what was going on. She didn't look pregnant until the last minute. I saw her a couple of months later and she was like a balloon. She hid it well."

Fisher and Cohen already have a daughter named Olive, but have yet to confirm the gender of the new baby.