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It's a boy-band bonanza!

One Direction performed Backstreet Boys' classic "I Want It That Way" at a recent concert in Stockholm, Sweden.

The boys honored a fans' request to sing the BSB song during a Twitter Q&A in the middle of the show.

But it wasn't just fans who took notice!

The Backstreet Boys themselves took to Twitter to compliment the Brits on their amazing rendition.

They wrote: "Heard @OneDirection did an impromptu performance of "I Want It That Way" in Sweden last night. Well done bros!"

And just like that, all is right in the world…