Turns out the whole "Jonas Brothers" thing is all Hanson's fault -- 'cause when we asked Zack if the new batch of cheesy jingle writing, over-priced hair-cut sporting, band of brothers stole their act ... dude didn't exactly deny it!
One thing they'll never steal -- mmmBop ... which Zack says he's performed more than 1400 times!!!!
Hanson to Jonas Bros: You 'Cat Burgled' Our Act!
9/5/2009 2:55 AM PDT BY TMZ STAFF
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