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Stone Cold Steve Austin

I'm Gonna Kick Bieber's Ass

If He Doesn't Straighten Up

1/31/2014 12:00 PM PST BY TMZ STAFF

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Stone Cold Steve Austin just threatened to open a can of WHOOP-ASS all over Justin Bieber ... warning the pop star that if he doesn't straighten up, he's gonna catch a Size 13 in his ass.

The former WWE champ was on "The Arsenio Hall Show" last night when he issued the ultimatum -- shape up ... or else.

Stone Cold says he loves kids ... and just wants to make sure Justin gets on the right path before it's too late -- but he thinks an ass-kickin' is the only thing that'll get through to the Biebs.

"Sometimes you just got to keep it simple."

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