Greeted by a chorus of screaming teens, the talented stars of 'High School Musical' caused chaos in Leister Square.

The latest instalment in the smash hit movie series has already broken box office records, taking the most advance bookings ever in the UK.

It's without a doubt the year's biggest kids and teen movie starring the hottest hunk on the planet Zac Efron. 'High School Musical 3: Senior Year' hits cinemas from October 22, but until then check out what's making the nation's teens scream.