Beastie Boys star Adam 'ad-Rock' Horovitz stunned fans by performing a mini gig at a New York bar on Sunday (08Dec13).

The hip-hop icon made a guest appearance at Joe's Pub to perform with a spoof rapper called Champagne Jerry.

The duo took to the stage to deliver a rendition of Yo Kev!, a song penned by Jerry, to which Horovitz has contributed a guest verse and production.