Wow! From TMZ:

Red Hot Chili Peppers singer Anthony Kiedis just threw down with a security guard outside the Four Seasons in Philly -- after the hired muscle REFUSED to let Kiedis enter the hotel -- and the footage is insane.

Sources on scene tell TMZ, the Rolling Stones were making their exit from the hotel at the same time Kiedis was approaching -- and the security guard thought Kiedis was just another fan.

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