Backstreet Boy A.J. McLean and his wife Rochelle DeAnna Karidis are expecting a baby.

The couple made the happy announcement in a YouTube video on Sunday.

"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," McLean said.

"Because we love you all so much we wanted to share with you for the first time something very special...We are having a baby!"

McLean also tweeted the baby news:

"I'm gonna be a dad!"

McLean proposed to Karadis during a live concert in Las Vegas in January 2010. They married last December.

The Backstreet Boys are currently on their Europe Tour Spring 2010 with The New Kids on the Block as KKOTBSB.

Watch the Announcement Below:

Tags: Backstreet Boys