Maryann Tobin

True Blood star Anna Paquin is pregnant with the first child of husband and True Blood co-star, Stephen Moyer. The couple wed in 2010 after meeting on the set of the HBO hit series in 2007.

Stephen Moyer, who plays the sexy Vampire King of Louisiana, Bill Compton, has also been the on-screen lover of Sookie Stackhouse (Anna Paquin) since the beginning of True Blood series.

Paquin, 29, and Moyer, 42, announced their happy news on Twitter on Wednesday.

While Moyer has two children from previous relationships, this is Anna Paquin's first pregnancy. The baby is due in the fall, according to the Washington Post.

Both Anna Paquin and Stephen Moyer will be returning to HBO in True Blood Season 5, which is set to premier on June 10, 2012.