The actress revealed that she's pregnant by debuting her baby bump during the launch of Givenchy's new Live Irresistible fragrance, reported Ace Showbiz.
Seyfriend, 30, looked stylish that night as she flaunted her belly in a sheer mini dress.
Pulling her hair into a ponytail, the "Mean Girls" star teamed her simple black outfit with strappy heels of the same colour.
This will be the first child for both Seyfried and Sadoski, who began dating earlier this year while working together on "The Last Word".
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