Nick and Vanessa Lachey have signed up for 'Dancing With The Stars'.

Nick and Vanessa Lachey

Nick and Vanessa Lachey

The couple - who recently celebrated their sixth wedding anniversary - are set to compete against each other on the upcoming season of the dance show, which will premiere on September 18, PEOPLE reports.

'Property Brothers' Drew Scott and wrestler Nikki Bella are also among the celebrities who have signed up.

Nick, 43, and Vanessa Lachey, 36 - who have three children together - will be the second married couple to compete on 'DWTS', following Carlos and Alexa PenaVega's stint in 2015.

Alexa placed sixth, while her husband made it to the semi-finals on season 21.

Meanwhile, Vanessa and Nick welcomed a baby boy called Phoenix over the festive season.

Vanessa shared on Instagram at the time: "It's a very Merry Christmas indeed! We had our Christmas Miracle. Phoenix Robert Lachey decided to show up early and was born on Christmas Eve. Mommy, Daddy, Camden & Brooklyn LOVE You very much! #LacheyPartyOf5 (sic)."

And Nick and Vanessa - who already have Camden, four, and Brooklyn, two, together - previously spoke about the joys and the responsibility of being parents.

Vanessa said: "When I introduced Camden to Brooklyn, I had my doctor give me some tips.

"I had Camden give a gift to Brooklyn - we laid out three stuffed animals, we said, 'Which one do you want to pick for Brooklyn?' He goes, 'That one, that one!' and so he picked the little giraffe."

And Nick added: "It's just all-encompassing. You would do anything for your children - not that you wouldn't for your wife or someone else you love, but there's a sense of protectiveness and responsibility that comes with your child which you don't feel in any other relationship. [Becoming a dad] has changed my life in every possible way."

However, Nick and Vanessa insist they don't want anymore children and are happy with their three.

Nick said: "You have three, and then you see: we're truly outnumbered now [but] it's such a blast to be at home with them and to see the way they interact with each other."