McLean, 42, seemingly teased his "big news" via Instagram on Monday, showing fans all the hard work he's been putting into his diet and fitness regime over the last five months.
"I'm on a very strict diet, grain-free, gluten-free, sugar-free, no sodas of any kind, and completely sober for almost nine months," he revealed. "This amazing, but rigorous, workout is all due to my amazing trainer, Mr. Bobby Strong. He's been a huge asset in my transformation, trying to get myself prepared and ready for what's to come in the next few weeks."
"A lot of surprises coming from me," he teased. "I can't tell you guys exactly what yet but I'm doing this for two reasons: one, to get in the best shape of my life, and to be healthy and to be happy, physically, mentally, and emotionally, and there's something else coming up. Can't tell you what it is but believe me you'll know why based on that."
ABC officially confirmed McLean's casting on Good Morning America on Thursday, Aug. 27. The singer also shared the news on his social media accounts, writing, "We’re going for the mirrorball, baby!! I am so grateful to @dancingabc and @abcnetwork for the opportunity to be joining this season’s cast of #DWTS. I also want to thank my wife and my two girls for letting Daddy go on this new adventure. I’m doing it ALL for you!"
We’re going for the mirrorball, baby!! I am so grateful to @dancingabc and @abcnetwork for the opportunity to be joining this season’s cast of #DWTS. I also want to thank my wife and my two girls for letting Daddy go on this new adventure. I’m doing it ALL for you! pic.twitter.com/D7K7SY1F1D
The full star lineup will be revealed Wednesday, Sept. 2 on GMA. So far, McLean and Bristowe are the only celebrity contestants who've officially been confirmed.
"I'll be happy with whoever they partner me with. I just feel like they're all incredible," Bristowe said of the pro dancers, while chatting with ET after the exciting reveal in June. "They have to be to be on that show!"
Of course, McLean wouldn't be the only BSB member who's given DWTS a shot. Nick Carter took second place in season 21 with Sharna Burgess, who's making her highly anticipated return to the show this year after taking a season off. Perhaps the pro dancer could be paired with another BSB boy?
As we patiently wait to hear more on the all-new season, watch the video below to hear what Emma Slater and Sasha Farber said about having to live apart during the duration of production: