Eric Dane and Rebecca Gayheart Expecting Second Child
07/08/2011 AT 05:30 PM EDT
Looks like that number may be going up: The couple is expecting their second child, a source confirms to PEOPLE.
The new arrival will join the couple's daughter Billie Beatrice, 16 months, whom Gayheart, 39, and the Grey's Anatomy star, 38, welcomed last year.
"I don't know if there's any change more significant that a human being can make than that of a woman become a mother," Dane told PEOPLE in May. "There's no change more dramatic."