"Fall Out Boy" bassist Pete Wentz and girlfriend Meagan Camper welcomed their first child together on Wednesday. They named their newborn son Saint Lazslo.

Wentz's rep shared in a statement, "Mom and baby are happy and healthy. They are thrilled at the addition to the family and Bronx is over the moon to be a big brother." 

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Five-year old Bronx is Wentz's son with former wife, singer Ashlee Simpson.

Wentz and his model-girlfriend announced the pregnancy on Instagram in February. He shared a photo of him and Camper kissing captioned, "We're super excited to announce we're expecting a baby!"

In May, Wentz shared that they decided not to ask the doctor what sex the baby was, and that they'd rather wait for the baby's birth and be surprised.

Wentz and Ashlee Simpson were married in 2008, and in November that year, Simpson gave birth to their son Bronx on November 20, 2008.

Their marriage didn't last and Simpson filed for divorce, citing "irreconcilable differences". Later on, Simpson admitted they simply got married at such a young age that the marriage wouldn't work.

"It was honestly a classic case of marrying young, having a kid young and growing apart over the years," a source close to the couple then said.

Wentz allegedly did not want the divorce and spiraled downward. After being drug-free for sometime, he went back to his addiction after the divorce. "I was scared of everything. I thought there were always people listening to me. Like, I had my house searched for bugs. It was crazy," he shared.

However, despite the failure of his marriage and battles with addiction, Wentz managed to move on. He has been with Camper for over three years.