AJ McLean and Rochelle Deanna Karidis AJ McLean and Rochelle Deanna Karidis

Get ready for another Backstreet baby.

Backstreet Boys' A.J. McLean and his wife, Rochelle DeAnna Karidis, are expecting their first child, the couple announced in a video posted on YouTube Sunday.

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"I just wanted to say thank you guys for all your love and support. We recently got married — I was the most recent Backstreet Boy to take the plunge," the singer says. "Because we love you all so much, we wanted to share with you — for the first time — something very special. We're having a baby!"McLean, 34, and Karidis wed in December.McLean will be the fourth Backstreet Boy to become a dad. Brian Littrell, Howie Dorough and Kevin Richardson, who rejoined the group over the weekend, all have a son.Watch McLean's announcement below.