It’s a bouncing baby…Bronx for Ashlee Simpson-Wentz and Pete Wentz.

Simpson-Wentz, 24, gave birth to Bronx Mowgli Wentz on Thursday, reportedly at Cedars-Sinai Medical Center is Los Angeles.

Simpson-Wentz is the younger sister of pop singer Jessica Simpson, famous for her lip-syncing slip-up on Saturday Night Live in 2004. Wentz is the bass player for Fall Out Boy. They married May 17 this year in L.A., and later revealed that Simpson-Wentz was expecting at the time of their nuptials.