High School Musical actress Ashley Tisdale has never fancied co-star Zac Efron - because he is more like her brother.

The actress isn't surprised by the heart-throb's legions of female fans across the globe, but insists she has never lusted after Efron.

She tells America's Seventeen magazine, "I've never been attracted to Zac, and he's never been attracted to me - which is even more amazing! Ha!

"He always says I look hot, and I'm like, 'Aw, thanks Zac,' but really, it's more like siblings than a flirty relationship - he's seriously like my brother."