Pete Wentz is a daddy again!

The Fall Out Boy bassist and his girlfriend Meagan Camper welcomed their first child together, a boy named...Saint Lazslo!

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

Bronx, by the way, is Wentz's 5 1/2-year-old son with ex-wife Ashlee Simpson.