Mark Wahlberg and his wife Rhea Durham welcomed daughter Margaret Grace Wahlberg at 6:35PM on Monday (January 11) at Cedars Sinai Medical Center in Los Angeles.

“Mark was in the delivery room with Rhea,” a source tells Star. “And he cheered her on all the way.”

Baby Margaret joins older siblings Ella, 6, Michael, 4 and Brendan, 1. The Wahlbergs married last August in Beverly Hills. Congrats to the happy family!