The pair has signed on to join the likes of Nick Carter, Bindi Irwin and jockey Victor Espinoza on the dancefloor for the 21st season of the hit show.

The Penas were announced as contestants on the show's Instagram account on Thursday (27Aug15).

A note read: "Say hello to married couple @therealcarlospena & @vegaalexa who will both be sharing the dance floor together this season!"

Although they will pair up with professional dancers and fight for the coveted mirrorball trophy separately, Alexa insists she can't consider the Big Time Rush star her competition.

She tells Entertainment Tonight, "It's so good because he literally rehearses right next door. So he'll walk over to me and he'll just give me a kiss. It's just so encouraging. He is my teammate and my life partner, so I like that encouragement. I need it."

The venture also marks the first time the actors have worked together professionally, which was a big draw for Carlos, who says, "The opportunity to work with my wife was like kind of almost a number one because we love spending time together.

"We're almost two years married. It's still fresh. I was like, 'Babe, we got to do this', and here we are."

The new season of the show begins next month (Sep15).