Mark Wahlberg is hoping that three won't be a crowd in his nursery.

"The Happening" actor and his longtime girlfriend Rhea Durham are expecting their third child together, reports People.

Details about the impending birth, such as the sex of the baby and the due date, were not revealed.

Wahlberg, who just turned 37, and Durham, 29, have been together since 2001 and already have two children: Ella, 4, and Michael, 3 in July.

In "The Happening," M. Night Shyamalan's thriller opening Friday, June 13, Wahlberg plays a science teacher caught up in mysterious and frightening circumstances. His upcoming films also includ "Max Payne" with Mila Kunis and the big-screen adaptation of "The Lovely Bones," due out in fall 2009.