Pete Wentz Welcomes Baby Boy

Meagan Camper and Pete Wentz attend the Green Tie Ball XXI Benefiting Chicago Gateway Green at A. Finkl & Sons on September 15, 2012 in Chicago, Illinois.

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Saint Lazslo is the Fall Out Boy bassist's second son.

Pete Wentz and his girlfriend of three years, Meagan Camper, welcomed a baby boy on Wednesday, People reports. They've named the baby Saint Lazslo.

Pete Wentz Relaunching His Label as DCD2

It's the second child for Wentz -- the Fall Out Boy bassist also has 5-year-old son Bronx with ex-wife Ashlee Simpson -- and the first for Camper.

"Mom and baby are happy and healthy," Wentz's rep told People. "They are thrilled at the addition to the family and Bronx is over the moon to be a big brother."

Wentz has been busy relaunching his Decaydence label as DCD2 and promoting last year's Fall Out Boy comeback album and single.