High School Musical Heartthrob Zac Efron sneaks a look down Ashley Tisdale's top

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Zac Efron has been snapped eyeing up co-star Ashley Tisdale – despite standing next to his girlfriend Vanessa Hudgens, 18.

The hunky actor, 20, was posing with the girls to promote the DVD of High School Musical 2 on Monday when photographers snapped him taking a sneaky peak.

The actor couldn’t help himself peering down Ashley’s cleavage as she stood beside him dressed in a revealing purple frock.

But neither girls seemed to notice his straying glance and beamed happily at the cameras while Zac copped a cheeky eyeful.

SEE PICS of Zac Efron looking down Ashley’s top>>

Alison Adey