Emily Blunt
Not long after filming began, Blunt discovered that she was pregnant with her and husband John Krasinski's first child. Luckily, she found that her physical transformation was the perfect natural prosthetic to play the Baker's Wife, even if it meant costume designer Colleen Atwood had to continually make alterations to keep the star squeezed into her dress. "I had bigger boobs and I was overweight," says Blunt. "But she's a baker's wife, so it worked well." (Blunt gave birth to a daughter, Hazel, in February.)