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If you attended Saturday's Cubs-Brewers game, you might've noticed that a hot dog vendor threw out the first pitch. If you were really paying attention, you might've noticed that the hot dog vendor looked a lot like the host of The Late Show with Stephen Colbert.

Sure enough, a disguised Stephen Colbert spent the day serving as a vendor -- all for an upcoming show. Here's a look at his first pitch:

After doing work on the mound, Colbert doled out hot dogs in the stands ...

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USATSI

... before taking his act to the Cubs dugout and first baseman Anthony Rizzo.

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This has been a weekend of disguises at Wrigley Field. No word on whether Colbert and Theo Epstein traded costume tips -- or on who'll get in on the act come Sunday.