The True Blood stars announced Paquin's pregnancy in April. However, co-star Sam Trammell let slip last week that the couple are actually having two babies.
Moyer, who is already the father of two children from a previous relationship, has since told US Weekly that the speculation is true.
"I love my kids beyond anything. They're the best things ever, and having two more is just going to be even more crazy, but that's cool," he told the publication.
Moyer and Paquin married in Malibu, California in 2010 after two years of dating.
Paquin recently confessed that she is unsure what kind of mother she will be as she has two different sides to her parenting personality.