A Backstreet baby's on the way!

Us Weekly reports that Nick Carter and his wife, Lauren Kitt, are expecting their first child. Us reveals that Kitt is four months along.

"They are so happy and overjoyed," according to an insider. "They've been trying and waiting for such a long time."

The couple were married at the Bacara Resort and Spa in Santa Barbara, Ca in April 2014 and were engaged for a year before then.

Carter is currently a contestant on Dancing with the Stars.