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Alexa Vega, Carlos Pena

Barry King/FilmMagic

The couple that dancers together stays together!

For the first time in 21 seasons, Dancing With the Stars is pitting husband vs. wife in the ballroom! A source exclusively tell E! News that Alexa Vega and husband Carlos Pena are set to join the cast of the upcoming season, premiering on Sept. 14. (ABC does not comment on casting rumors.)

The Spy Kids star, who turned 27 today (Happy Birthday!) and the Big Time Rush singer tied the knot back in January 2014, in an intimate ceremony in Puerto Vallarta, Mexico. Vega and Pena, who both now use the last name PenaVega on social media (Too. Cute.), began dating in 2012, and we're excited to see how the longtime couple handles becoming competitors!

Vega, who is also known for her role in Machete Kills, and Pena, who is set to play Kenickie in Fox's highly anticipated Grease: Live, are the ABC reality hit's first married couple to compete against each other. (Former pro-turned-judge Julianne Hough competed with then-boyfriend Chuck Wicks in season eight.)

Pena, 26, wouldn't be the first member of Big Time Rush to compete on DWTS, as James Maslow finished in fourth place in season 18.

So far, season 21's cast includes Bindi Irwin, the teen daughter of the late Steve Irwin, Backstreet Boy Nick Carter, and Victor Espinoza, as well as Paula Deen and Chaka Khan, which E! News exclusively reported. And Vine star Hayes Grier revealed on Twitter that he is also set to join the cast, revealing his first rehearsal was set to take place today. 

The full cast will be announced on Good Morning America on Sept. 2, along with the remaining three professional dancers. So far, Karina Smirnoff is set to return to the show after sitting last season out, along with returning champ Val ChmerkovskiyDerek HoughMark Ballas, Artem ChigvintsevAllison HolkerWitney CarsonSharna Burgess and Peta Murgatroyd.

DWTS premieres Monday, Sept. 14 on ABC.

—Reporting by Beth Sobol