The 'For Your Entertainment' star will mentor the contestants on the importance of stage presence and join them in an acoustic rendition of his hit track 'Whataya Want From Me'.
Watch a preview of Adam Lambert on Majors & Minors below:
Lambert is the latest in a string of stars to appear on The Hub talent competition, which sees the 10 to 16-year-old contestants being offered guidance and support from some of the biggest names in the industry.
Producer Evan Bogart previously told The Hollywood Reporter that Lambert had specifically asked to work with the contestants on stage presence.
"He really wanted to work with the kids on stage presence and delivering the right performance," he said earlier this year.
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Bogart added: "Even when you're not the person singing, what you're doing, how you're interacting with other people on stage, how you're being a part of it when you're not the centre of attention.
"And then when you are the centre of attention, how you grab that, run with it, and then pass it off. Because a lot of the performances are done as an ensemble. So, Adam worked with them individually on their movements and their presence.
"It was something he specifically said he wanted to do."
Leona Lewis, Avril Lavigne, Brandy, Jennifer Hudson, will.i.am, Colbie Caillat, Sean Kingston, Jordin Sparks, Ryan Tedder and Mike Posner are also involved in the show.
Majors & Minors continues Sunday at 7pm ET on The Hub