Lady Gaga took the stage at Lollapalooza yesterday -- but the crazy part came when she took to the crowd during a performance by Semi-Precious Weapons.
Major props to Gaga for bonding with the fans -- double props for doing it in that outfit.
Lady Gaga Crowd Surfs at Lollapalooza
8/7/2010 6:15 PM PDT BY TMZ STAFF
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