The couple announced the happy news on Instagram.com on Thursday (16Jun16), by posting a photo of them holding a pregnancy test.

"Breaking news," he wrote on the social media site. "It's #ClearblueConfirmed! There is going to be a new cool kid in town... And by cool I mean dorky just like their father. A little PenaVega is on the way!!! #ItsHappening #HolyWow #Imgoingtobeadaddy #clearbluepartner."

"I cannot believe I finally get to say this... WE'RE PREGNANT!!!," she added. "It's #ClearblueConfirmed that a little blessing is joining the PenaVega family!!! We can't wait!!! #ItsHappening #HolyWow."

Carlos and Alexa wed in January, 2014, and in January (16), the Big Time Rush star opened up about the pair's desire to become parents.

"I would love to get a mini PenaVega out, but it's a lot harder than I thought," he told U.S. news show Entertainment Tonight. "It's not easy. I'll just say, when it happens it happens."