July 09, 2013 03:15 PM

Evan Agostini/Invision/AP

Make room for the littlest Jonas.

Eldest brother Kevin Jonas and his wife Danielle are expecting their first child, their rep confirms to PEOPLE.

“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,” the rep says. “They are very much looking forward to building a family together.”

“It’s true – Danielle is pregnant! Can’t even imagine how excited we are,” the musician and reality star, 25, Tweeted Tuesday. “I can’t wait to share this with my best friend. I love you baby.”

The couple, who married in December 2009, told PEOPLE last July that babies were beginning to be on their minds.

“Having kids is a big question right now; it does come up a lot,” Danielle, 26, said at the time.

“We’re at that [3-year] mark and people are like, ‘All right guys, what’s your plan? When are you going to have those grandkids?'” adds Kevin. “I’m starting to feel that pressure a little bit.”

E!, which airs their show Married to Jonas on Sundays at 10 p.m., was first to report news of the pregnancy.

— Sarah Michaud with reporting by Sharon Cotliar

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