It's a son for Backstreet Boy Nick Carter and wife Lauren Kitt

Backstreet Boy Nick Carter (L) and actress wife Lauren Kitt are expecting their first child. Photo / Getty

Backstreet Boy Nick Carter and his actress wife are expecting their first child, and have announced it's a boy.

The singer and fitness expert and actress Lauren Kitt, who tied the knot in 2014, were recently reported to be having their first child and this week discovered the gender on Dancing With the Stars.

The 35-year-old singer, who is competing with professional Sharna Burgess, and his 32-year-old lady were helped by co-host Erin Andrews to open a giant box, which released dozens of blue balloons.

The happy couple shared a kiss and admitted the news was "unbelievable".

They also admitted having faced previous struggles to have a family, with Lauren, who is 16 weeks pregnant, previously suffering a miscarriage.

"We've been trying to have a baby for about a year now," Carter said. "It's been rocky, to be quite honest with you. There have been times when we thought it wouldn't happen."

"It was really hard on Nick. Just watching him get so excited about something, and see him get so hurt, it was hard," Kitt added.

After the show, the I'll Never Break Your Heart singer confirmed their happy news in a statement.

"My wife and I are happy to personally announce that we are pregnant.

"It has been our dream to have a family together and we cannot wait to welcome our first child into the world."

- Bang! Showbiz