Will it be a Backstreet Boy…or Girl? Nick Carter is expecting his first child with his wife, Lauren Kitt, a source confirms exclusively to Us Weekly. The fitness pro, whom Carter married in April 2014, is about four months pregnant.

"They are so happy and overjoyed," the insider tells Us of the parents-to-be, who documented their romance on the VH1 reality show I Heart Nick Carter. "They've been trying and waiting for such a long time."

The Backstreet Boys heartthrob, 36, proposed to Kitt, 32, with a 7-carat diamond ring back in February 2013. They said "I do" in a romantic ceremony in Santa Barbara, Calif., last year, with his bandmates AJ McLean, Howie Dorough, and Brian Littrell in attendance.

An eyewitness told Us at the time, "They shared the longest wedding kiss I've ever seen. A full minute later they were still kissing. They seem crazy in love and thrilled to be married. You could feel the love bursting out of them."

Indeed, Carter told Yahoo in September 2014 that he sensed Kitt was The One from the first minute they met. "I just felt an instant connection," he gushed. "It's like I just wanted to be around her."

That's the key, his wife added. "You have to find someone that you love and that loves you just as much. We can spend 24/7 with one another," she told Yahoo. "I can't even spend that with my sister or my girlfriends, but I can spend 24/7 with him."

These days, Carter is devoting at least some of that time to Dancing With the Stars. The boy bander is a contestant on Season 21 of the ABC show, competing with pro partner Sharna Burgess.