'True Blood's' Anna Paquin, Stephen Moyer Expecting First Child Together

Anna Paquin and Stephen Moyer

UPDATED: The HBO co-stars have been married since August 2010.

True Blood co-stars Anna Paquin and Stephen Moyer are expecting their first child.

The couple, who met on the set of their HBO vampire drama, have been married since August 2010 and their baby is due in the fall, The Hollywood Reporter has confirmed.

This would be the first child for Paquin, 29. Moyer, 42, has two children, a 10-year-old daughter and a 12-year-old son, from a previous relationship.

As an 11-year-old, Paquin won an Academy Award for The Piano. She and Moyer have starred on True Blood as Sookie and Bill since the Alan Ball series debuted on HBO in September 2008.

True Blood is slated to return for its fifth season on June 10.

EW was the first to report the news.