The BSB singer, who is also competing on this season of Dancing With the Stars, is expecting his first baby with Kitt, sources tell ET. The couple married in April 2014.
Carter and Kitt, a fitness pro, documented their romance on the VH1 reality show I Heart Nick Carter, and the 35-year-old singer got some relationship advice from fellow boybander, New Kids On The Block's Jordan Knight, when the two toured together last year as part of their side project, Nick and Knight.
"I would say, you have to tell your wife when you’re going on tour," Knight told ET at the time. "Let her know your plans. Don't tell her the day before or the week before – keep her in the loop!"
Carter threw it back to his early Backstreet days earlier this season on DWTS, recalling 1992, the year he joined the boy band.
"I’ve learned so much right now and I’m just so grateful and so honored to be a part of the process," Carter said of his DWTS experience at the time. "I think it’s helping me grow as a human being, really. Because it’s not just about the dance, it's about being strong in the moment and being able to overcome adversity."
Check out his nostalgia-packed performance in the video below.