Pregnant Amanda Seyfried shows off her baby bump

It's official: Amanda Seyfried is pregnant.

The 30-year-old actress is expecting her first child with her fiance, actor Thomas Sadoski, Seyfried's publicist Evelyn Karamanos confirmed to USA TODAY.

The Mean Girls star showed off a small baby bump at a Givenchy event on Tuesday. She is the face of the fashion house's new Live Irresistible fragrance.

Seyfried and Sadoski, 40, confirmed their engagement in September.

Last year, the actress revealed she was starting to think about having children. "I keep feeling like my eggs are dying off," she told Marie Claire UK in August 2015, while dating actor Justin Long (they split the following month).

"I need to get on it ... I want a child. Badly. I want to be a mother, badly. That's what I feel. I've been feeling it for like, two years.

"I'm not ready but nobody's ready. It changes everything ... so how can you ever be ready for that?"

Seyfried and Sadoski started dating this spring while filming their upcoming drama, The Last Word.

The couple first met on Broadway in 2015 as co-stars in The Way We Get By, a Neil LaBute play about a one-night stand.