TooFab's Week in Celebrity Photos: June 24 - June 30

Get ready to have the '90s hit get stuck in your head (again).

It may have been nearly two decades since "I Want It That Way" came out, but the song is still a bop.

The Backstreet Boys stopped by The Tonight Show Thursday night and performed their pop hit, but with a new spin -- they used only classroom instruments.

Nick Carter, Brian Littrell, AJ McClean, Kevin Richardson, and Howie Dorough were joined by Jimmy Fallon and The Roots to perform the new rendition. And Fallon fit in flawlessly as an honorary sixth member.

Carter rocked the tambourine, while Littrell jammed out with an apple shaker and wood block. McClean shook the maraca, Richardson played the Güiro, and Dorough rocked out with a coconut. However, the late-night host switched it up on multiple occasions and played several instruments, including an electronic keyboard, bass drum, and apple shaker.

The most incredible moment was during the bridge (around 2 minutes), which had all 14 men getting really into it. The performance was so good, you'll want to listen to it all day.

Watch the full video below.

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