Ashlee Simpson-Wentz and husband Pete Wentz are the happy parents of newborn Bronx Mowgli Wentz, a spokesperson has confirmed to People magazine.

Simpson-Wentz, 24, delivered a boy, named Bronx Mowgli Wentz, on Thursday night, weighing 7 lbs., 11 oz., and was 20 1/2 inches long. All three are “healthy and happy,” the spokesperson said, and thank everyone for their well wishes.

Ashlee Simpson-Wentz and Pete Wentz, 29, first revealed they were expecting a baby in May, with the singer saying she was enthusiastic about one day having a large family and her Fall Out Boy bassist hubby quipping, “A big soccer team or a band!” Bronx is their first child.

The two artists began their relationship in late 2006 and soon became inseparable and quite the tabloid fodder. Countless articles were published about their relationship, about their supposed engagement, a baby on the way, plans to marry.

Ashlee and Pete addressed such rumors via messages posted on FriendsorEnemies.com. In early April, they thus revealed they were “happily engaged,” thanked their fans for their support and well wishes and declared they wanted their public to know first “because you guys are the best.” Earlier this year, Ashlee had been spotted wearing a diamond ring on her engagement finger, which she explained was a promise ring from Pete.

In April, Joe Simpson, father to Ashlee and her older pop turned country singer sister Jessica Simpson, told People.com he was excited to have Pete join the family and said they were all “blessed.”

Later that month, both lovebirds denied rumors regarding impending parenthood. Ashlee took to her MySpace Celebrity blog while Pete sent an impassioned email to MTV News complaining there is a “witch hunt” for people to be expecting a baby whenever they become engaged, which is not always necessarily the case.

Ashlee and Pete surprised everyone in mid-May when they secretly married at her parents’ home in Los Angeles. Jessica Simpson, who was accompanied at the event by Dallas Cowboys quarterback Tony Romo, acted as maid of honor while Pete’s bulldog Hemingway acted as ring bearer. After the Alice in Wonderland-inspired wedding, the two honeymooned in Turks and Caicos.

She changed her name to Ashlee Wentz, saying she found this tradition, of the wife taking the husband’s name, to be meaningful, and added she would go professionally as Ashlee Simpson-Wentz.

Hardly had two weeks passed from the wedding when the newly married couple revealed they were expecting a child. Earlier this month they held a Winnie the Pooh-themed baby shower.