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The oldest Jonas brother is having a baby! Kevin Jonas, 25, and wife Danielle, 26, are expecting their first bundle of joy, a rep confirmed.

“Dani and Kevin are thrilled that Dani is pregnant with their first child. They are, of course, elated, and so excited to share this news with their fans,” said their rep. “They are very much looking forward to building a family together.”

The musician/reality star tweeted about his wife of three years on Tuesday, “It’s true – Danielle is pregnant! Can’t even imagine how excited we are. I can’t wait to share this with my best friend. I love you baby.”

The couple, who married in December 2009, star on E!'s Married to Jonas, which airs on Sundays at 10 p.m.