MmmB-ack up: Hanson haven come out swinging against Justin Bieber, whose music the group says makes them a particular kind of ill.

Hanson, who first shot to fame 20 years ago with "MmmBop," played a game of "Whose Song Is It Anyway" with Australia's Hit 107 FM's Amos, Cat and Angus Monday (June 18) when "Despacito" — the remix of which features Bieber as a vocalist — came up. The group had correctly guessed Britney Spears' "...Baby One More Time," but when the Daddy Yankee and Luis Fons song began playing, they found themselves totally stumped. And they were happy to remain in a state of confusion.

"I’m glad I didn't know what that was," Taylor said.

"I prefer not to get any venereal diseases, so whenever Justin Bieber gets sort of near me or near my ears..." Isaac noted.

"It’s Chlamydia of the ear," Zac added.




Still, Hanson are very much in the minority — "Despacito" has topped the Billboard Hot 100 for the sixth week in a row, the site reported yesterday (June 19). And, the remix featuring Bieber, specifically, has accounted for "80 percent of the song's sales for a third consecutive week," Billboard adds.

Cutting Celeb-on-Celeb Disses:

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