Hanson and Weird Al have a new music video ... and no, this isn't news from 1997.

Al's only role is to play tambourine and flail around like a maniac -- but the "MMMbop" bros and 300 extras, including two of Taylor's own kids, really stepped it up to dance to the catchy new single "Thinking 'Bout Somethin'."

Their new album, "Shout it Out," hits stores June 8.

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