January 13, 2010 01:05 PM

Jon Kopaloff/FilmMagic

Baby makes six for Mark Wahlberg and Rhea Durham, who welcomed a daughter Monday, Jan. 11th, a source confirms to PEOPLE.

Grace Margaret Wahlberg joins siblings Brendan Joseph, 16 months, Michael, 3 ½, and Ella Rae, 6.

The Lovely Bones actor, 38, confirmed the pregnancy in October, announcing that Rhea was expecting a girl.

Will the brood continue to grow now that Grace has arrived? That’s up to his model wife, Mark says.

“My wife is allowed to pick the magic number … as many as she wants to have.”

— Julie Jordan

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