Leelee Sobieski Is Pregnant

By Missy Ritti

Wednesday September 16, 2009 12:05 PM EDT

Hector Vallenilla/Pacific Coast News

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Emmy-nominated actress Leelee Sobieski and her fashion designer fiancé Adam Kimmel are poised for first-time parenthood, a rep for the Joan of Arc star confirms to PEOPLE.

The "thrilled" couple – who announced their engagement in June – are expecting the baby in December.

Sobieski, 27, has modeled for Kimmel's Fall/Winter 2009 look book, and most recently appeared in this summer's Public Enemies alongside Johnny Depp; She can next be seen in The Mad Cow opposite Jeffrey Tambor.

• Reporting by LISA INGRASSIA