One of the world's best-known DJs -- Frenchman David Guetta -- teams up with YouTube sensation Keenan Cahill for an outrageous preview of a new dance

The 15-year-old Cahill became a huge hit on YouTube when he lip-synced Katy Perry's song "Teenage Dream" on his site and Katy liked it so much she tweeted "I heart you" to the teen sensation's Twitter page. Another of his musical works featured a cameo by rapper 50 Cent himself when Cahill recorded his song "Down on Me."


The teen's YouTube channel boasts nearly 200,000 subscribers and his videos have been viewed tens of millions of times. Guetta -- whose new album One More Love is in stores now -- says he liked Cahill's videos so much that he contacted him and then flew to Chicago last week to meet him and make the video.


Cahill has a rare genetic disorder known as Maroteaux Lamy Syndrome, which results in some of those afflicted developing a dwarf-like appearance.