The actress, who gave birth to her first son, Alexander, last July, is back in shape and on the set of her new film. FemaleFirst reports that the star lost the weight with the aid of a personal trainer.
Watts explained, "Three weeks before we started filming ‘The International’ I decided that I better get into changing my body back again. And they gave me a trainer and it was very effective and also breastfeeding."
The 39-year-old star, who is engaged to actor Liev Schreiber, admits that motherhood is tougher than she expected. She said, "My son is a true joy, every day it is total euphoria. But motherhood is harder than I thought. The biggest surprise was the lack of sleep. Alexander is still struggling to sleep through the night."
The International, also starring Clive Owen, will be released in September.