Taylor Swift was probably a huge Hanson fan when "MMMbop" came out in 1997 -- but these days, they're singing her songs!

Zac, Issac and Taylor (now 26, 31 and 29) covered Swift's newest single "We Are Never Ever Getting Back Together" while performing for Australian radio show Fifi and Jules.

We're loving their version ... and we're not alone. So does Taylor herself!

After watching the video, Swift went immediately to Twitter to tweet about her new obsession.

"1) Hanson covered 'We Are Never Getting Back Together'. 2) I didn't just watch the video of it 8 times in a row. 3) #2 might be a lie," she posted last night.

Check out their covers above -- plus see how other former teen idols have grown in the gallery below!


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