Watch Katy Perry's Teenage Dream-er

15 year old Keenan Cahill from Chicago has become one of YouTube's biggest hits of the year so far, posting parodies of some of his favourite hits.

Katy Perry is the latest star to have the Cahill treatment as Keenan posted a parody of her latest hit 'Teenage Dream' on YouTube. The Californian Gurl posted it on her Twitter page last night, along with the simple message 'I heart you @KeenanCahill'.

Check out the video and tell us what you think below:

Big Sean and Little Sean

WATCH: Move Over, Big Sean! Roman Interviews Little Sean And Your Heart Will Melt In 3, 2, 1...

Leigh-Anne Pinnock joins Snapchat

80+ Of The Best Popstars You Should Have On Snapchat

My Capital App

Want To Control The Music On Capital? Now You Can With Our New App!