New Kids on the Block, the biggest boy band of the late-'80s/early '90s, and the Backstreet Boys, the biggest boy band of the late-'90s/early '00s, are joining forces to form NKOTBSB, a supergroup set to tour next year.

Though details are still sketchy, the groups are expected to perform together as a single unit for at least part of the shows. They will make their debut at the American Music Awards on Nov. 21.

Tour dates will be announced Monday.

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Dangerous heat ... America 250: Manor of St. George ... Mets report card at All-Star break ... Get the latest news and more great videos at NewsdayTV

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