Mila Kunis has revealed she was pregnant when she returned to the set of sci-fi action film Jupiter Ascending for reshoots.

The actress admits her baby girl Wyatt made a cameo when she went back to record extra takes months after the film originally wrapped in London.

Kunis, who became a mum in September (14), says, "There is a scene in the movie where Wyatt does make her big screen debut. I was three months pregnant."

But the Black Swan star is keen to point out that she didn't have to perform any crazy stunts, like the ones she did during the main shoot.