The baby's middle name is Mowgli

Ashlee Simpson-Wentz has finally popped.

The singer and her husband, Fall Out Boy rocker Pete Wentz, welcomed their son Bronx Mowgli Wentz into the family Thursday night, according to news reports.

"Ashlee, Pete and baby Bronx are all healthy and happy, and thank everyone for their well wishes," says a rep.

Little Bronx weighed 7 lbs., 11 oz., and was 20 1/2 inches long. Although there's been no confirmation about the inspiration for the middle name, "Mowgli" is the lead character's name in "The Jungle Book."

Simpson-Wentz, 24, and the Fall Out Boy bassist, 29, got married in an Alice in Wonderland-themed wedding in May and then announced her pregnancy a few weeks later.

For some, it feels like the baby was long overdue. Wentz missed the final episodes of MTV's "Total Request Live" to wait for the baby. There's no word if Simpson-Wentz had to induce labor as her sister, Jessica Simpson, said on Tuesday's "Ellen DeGeneres Show."

Fall Out Boy's third album, "Folie a Deux," will drop Dec. 16.