Keenan Cahill, the 15-year-old Irish-American Internet sensation has released another viral lip-syncing performance, but this time it's especially for Christmas!

Keenan's latest track demonstrates his prowess in lip-syncing Mariah Carey's “All i Want for Christmas”.

Earlier this year one of his cover versions racked up over 16 million views on YouTube.

Keenan suffers from a rare genetic disease called Maroteaux-Lamy Syndrome, which occurs in once in every 340,000 births. Those diagnosed with the condition suffer from growth issues, a loss of vision and hearing among other serious complications.

Since launching his music career through a You-Tube channel he has enjoyed international fame and become on online sensation.

He even lately appeared on the Chelsea Lately Show in November where he did a lip-syncing duet with 50 Cent.

Check out his website here!

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