Ashlee Simpson

Ashlee Simpson and Pete Wentz welcomed a baby boy.

Bronx Mowgli Wentz was born Thursday evening, weighing 7 lbs., 11 oz., and measuring 20 1/2 inches long.

“Ashlee, Pete and baby Bronx are all healthy and happy, and thank everyone for their well wishes!” a spokesman said, according to People magazine.

Simpson-Wentz, 24, and the Fall Out Boy bassist, 29, announced her pregnancy in May, a few weeks after their Alice’s Adventures In Wonderland-themed wedding.

The Web site says Mowgli is a character who originally appeared in Rudyard Kipling’s short story “In the Rukh” and then went on to become the most prominent and memorable character in “The Jungle Book.”