The hilarious clip shows him declaring: "You may have seen me killing people in the TV series Rome or saving people in Grey's Anatomy.
"When I'm not doing that, I like to listen to Cuddly Shark."
Kev, 36, battles to keep a straight face as he is pecked on the head by a stuffed seagull then "mobbed" by an otter.
The Elgin-born star agreed to make the promo after being approached by Cuddly Shark guitarist Colin Reid and drummer Jason Sinclair at his party in Fochabers.
Colin, 31, said: "I've known Kevin since I was little. He is mates with my brothers.
"We had both enjoyed a few whiskies and just decided to ask Kevin if he would do a wee spot for us.
"He was right up for it. We just grabbed the animals and put together this completely unscripted video."
The boys uploaded the clip - dubbed Kevin McShark - to YouTube where it has already been viewed by hundreds from around the globe.
Colin added: "Some of the comments people have left are hilarious. Tey are gobsmacked that it's actually Kevin.
"But he's a pretty down to earth loon and always up for a jam. Even though he lives in Los Angeles, his heart still belongs to Elgin."
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