We have it on good authority that the screams in Leicester Square yesterday afternoon were enough to stop anyone in the surrounding offices from doing any work. Teens and tweens were out in force for the UK premiere of High School Musical 3: Senior Year, the first of the High School Musical franchise to make it to the big screen. Four of the main cast members hit the red carpet last night, alongside Brit newbie Jemma McKenzie-Brown for the most glamorous HSM premiere so far. CLICK THE IMAGE TO VIEW THE GALLERY