Bronx Wentz: Ashlee Simpson's New Son!

Ashlee Simpson-Wentz and husband Pete Wentz welcomed a son Thursday night at Cedars-Sinai Medical Center in Los Angeles.

Bronx Mowgli Wentz weighed 7 lbs., 11 oz., and measured 20 1/2 inches long.

A spokesperson tells People, “Ashlee, Pete and baby Bronx are all healthy and happy, and thank everyone for their well wishes!”

Congratulations, Ashlee and Pete!!! You now own a B.M.W.!!!

P.S. Pete and his pop-punk band, Fall Out Boy, have a third album dropping on Dec. 16 called Folie A Deux.