AJ and Rochelle married in 2011, and welcomed their first child, Ava Jaymes, the following year. The performer announced that his wife was pregnant with the couple's second child via Instagram in September 2016.
While the Boys currently have a residency at Planet Hollywood in Las Vegas, the band didn't have a show scheduled the night Lyric was born. Though, AJ did apologize to attendees at Friday night's show for having "prego brain," revealing that he and Rochelle would be welcoming baby No. 2 in less than 48 hours.
ET sat down with the Backstreet Boys last month, where AJ opened up about what fatherhood has meant to him.
"I love being my little girl's hero. It's the greatest thing in the world," the singer sweetly shared. "It makes me want to be a better father, a better husband a better person. She is the spitting image of me her personality and it's just like the coolest thing in the world. To be a dad is the best job. It's the best job in the world."
Congrats, AJ and Rochelle!
Meanwhile, the bandmates may be settling down now, but Nick Carter revealed in a recent interview that they had some pretty wild nights of partying in the past!