People released a recent image of Rhea Durham, the actor’s wife, sporting a baby bump.
If the pregnancy rumour is true, the couple’s fourth child will join siblings Ella Rae, 5, Michael, 3, and Brendan Joseph, 11 months.
Wahlberg has never hidden his desire to have a big family. Last summer, he commented, "When the kids are good, we want eight or nine."
In the meantime, moviegoers can next see the 38-year-old actor in the Peter Jackson film, The Lovely Bones, also starring Rachel Weisz.