Amanda Seyfried and her fiance are expecting a baby

Actress Amanda Seyfried and her fiance Thomas Sadoski are expecting their first child.

The Mamma Mia star announced she is pregnant while attending the launch of Givenchy’s new Live Irresistible fragrance in New York on Tuesday, People magazine reported.

Thomas and Amanda (Charles Sykes/Invision/AP)

Amanda, 30, got engaged to actor Thomas, 40, in September.

The pair reportedly met while working together on the off-Broadway show The Way We Get By last year, and began their romance when they reunited on the set of their upcoming film The Last Word.

Amanda, whose breakthrough role came in the 2004 comedy Mean Girls, previously dated her Mamma Mia co-star Dominic Cooper and actor Justin Long.

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