Seems Cristiano Ronaldo has a lot more free time on his hands now that he's single -- 'cause the soccer star decided to go under cover as a fat guy to screw with some fans.
Ronaldo threw on a beard, mustache, sunglasses and some fat guy padding ... and went out on the streets of Madrid Thursday to juggle a soccer ball ... just to see how people would react.
Eventually, Ronaldo ripped off the disguise ... and the people went crazy ... especially one young kid who got a hug from Ronaldo and an autographed soccer ball.
He's so sneaky.
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