Actress Jennifer Garner has confirmed she's pregnant with her second child.

After weeks of speculation, the worst kept secret in Hollywood has been revealed - after Garner's mother-in-law and her former Alias co-star Victor Garber let the baby news slip last month.

The actress says she and husband Ben Affleck are "so excited," adding, "It always makes me laugh when people say 'Is she? Isn't she?' It's like, 'Eventually you will know, so just chill out for a minute."

The celebrity couple already have a toddler, Violet, at home.