July 6th, 2011
02:05 PM ET
The cast of "Glee" knows a little something about lip-synching.
So does Keenan Cahill, the teen who has wracked up millions of views with viral videos on YouTube for lip-synching covers of hits.
"Glee" cast members Dianna Agron, Darren Criss, Jenna Ushkowitz, and Harry Shum, Jr. recently joined Cahill for a performance of Katy Perry's “Last Friday Night (T.G.I.F.).”
Looks like the "Glee" kids had even more fun than Cahill who has Maroteaux–Lamy syndrome, a rare, genetic disorder which gives him a dwarf-like appearance. The youngster has performed in videos with other stars including 50 Cent, Nick Cannon and David Guetta.
Check it out:
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