Nick, 35, made the announcement on an episode of "Dancing with the Stars" and also revealed that Lauren previously suffered a miscarriage, reported People magazine.
"We've been trying to have a baby for about a year now. It's been rocky, to be quite honest with you. There have been times when we thought it wouldn't happen," he said.
Lauren, 32, said the struggles to have a baby have been particularly tough on her husband.
"It was really hard on Nick. Just watching him get so excited about something, and see him get so hurt, it was hard," said Lauren.
More From This Section
"My wife and I are happy to personally announce that we are pregnant," Nick said in a statement following the show.
"It has been our dream to have a family together and we cannot wait to welcome our first child into the world."
The couple were married in April 2014. Their relationship and road to the altar was documented on VH1's reality show I Heart Nick Carter in 2014.