by Hilton Hater at . Comments

Keenan Cahill is at it again.

The Illinois teen, who has made a name for himself by recruiting celebrities to lip sync with him online to a number of pop hits, appears in a new video alongside Glee cast members Harry Shum Jr., Dianna Agron, Darren Criss and Jenna Ushkowitz.

Watch below, as Cahill - who is affected by Maroteaux-Lamy syndrome - and this all-star squad dance around to Katy Perry's “Last Friday Night (T.G.I.F.).”

Other stars that have teamed with Chaill include 50 Cent, David Guetta, Pauly D, Brian Wilson and Cody Ross.

by Free Britney at . Comments

Keenan Cahill, a 15-going-on-5-year-old from the Chicago area, has something of a cult following on YouTube, where he lip syncs to pop songs. That's basically it.

His first viral "hit" involved him choking on a cookie awhile back, but he REALLY hit it big when he "covered" Katy Perry's "Teenage Dream." It was his break.

Now a full-fledged online hit, Keenan Cahill "performed" on Chelsea Lately, doing his thing to "Down on Me" by Jeremith. Wait'll you see who makes a cameo ...

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