The 'HSM 2' cast are so chessy looking, like it is really that loud out there.

Zac Efron and the rest of the High School Musical 2 chums were mobbed by fans at their London signing.

The cheesy, but charming quintet greeted 1500 kids who turned up to the event in the hope of seeing their idols.

Some besotted supporters even camped out overnight to secure a face-to-face meeting with the stars.

Vanessa Anne Hudgens (Gabriella Martinez), Lucas Grabeel (Ryan Evans), Monique Coleman (Taylor McKessiee) and Olesya Rulin (Kelsi Nielsen) joined Zac (Troy Bolton) at Oxford Street's HMV store. 

Fans have another chance to see the stars at the premiere this Sunday at the O2 Centre from 11am.

High School Muscial 2, which broke TV viewing records in the US last week, can be seen by UK viewers on the Disney Channel on September 21st.

Also Corbin Bleu hasnt been seen with the Wildcats! because he is out on tour with Aly & AJ, and Drake Bell, promoting his new CD Another Side, which debuted at No. 36 on the charts.