Zac Efron doesn't like his own films.

The 'High School Musical' heartthrob insists the early movies he starred don't measure up to his latest, more adult orientated work, 'Me and Orson Wells'.

Britney Spears is set to perform at the 2009 Teen Choice Awards. The "Womanizer" singer - who is nominated in three categories - will appear on stage at the annual event on Sunday night at Universal City's Gibson Amphitheatre, in California.

Her performance will mark 10 years since the first Teen Choice Awards in 1999, where Britney - who is currently on a break from her world tour - was one of the performers.

Zac Efron has enjoyed a wild night out in Vancouver. The "High School Musical" actor - who has been desperate to shed his clean cut image in recent months - shocked onlookers by drinking a variety of alcoholic beverages during an evening with friends at Canadian night spot Opus Bar.

A source told FOX411: "They were all about partying. They were downing one Bitter Cherry Salome Sour after another, until they moved on to super strong Belvedere vodka and sodas."

Zac Efron has enjoyed a wild night out in Vancouver.

The 'High School Musical' actor - who has been desperate to shed his clean cut image in recent months - shocked onlookers by drinking a variety of alcoholic beverages during an evening with friends at Canadian night spot Opus Bar.