It's another boy for Pete Wentz! The Fall Out Boy bassist and his girlfriend, model Meagan Camper, welcomed their first child together.

PEOPLE reports that on Wednesday (Aug. 20), Meagan gave birth to the couple's son, who they named Saint Lazslo. Pete already has a son, 5-year-old Bronx, from his marriage to Ashlee Simpson.

His rep confirmed the exciting baby news, saying, "Mom and baby are happy and healthy. They are thrilled at the addition to the family and Bronx is over the moon to be a big brother.”

Back in May, the rocker, whose been dating Meagan for three years, expressed his excitement to E! News.

"What’s more exciting than having the pitter-patter of another little gremlin running around? ... Now it will be two-on-two," he said, adding that he didn't know the baby's gender. "We’re waiting. I think we’ll probably do a surprise on this one."

PopCrush sends our congrats and best wishes to Pete and Meagan!

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