Charlie Sheen and Drew Carey -- Photo Evidence

1/19/2011 8:35 PM PST

Charlie Sheen and Drew Carey in Las Vegas -- Photo Evidence

Here's proof Charlie Sheen can actually do something in Las Vegas that does NOT involve booze and escorts!

As TMZ first reported, Charlie jumped on stage during a taping of  "Drew Carey's Improv-a-Ganza" last weekend at the MGM Grand Hotel & Casino.

We're told Charlie unexpectedly joined in the live performance to show off his own improv skills -- and Sheen won't be cut out of the show when it airs on Game Show Network in March.