Ashley Tisdale and Vanessa Hudgens -- Throw Boat Load of ASS Party Ashley & Vanessa Throw Boat Load of Ass Party TMZ TV 5/20/2014 4:31 PM PT

Ashley Tisdale celebrated her bachelorette party with pal Vanessa Hudgens on a huge yacht in Miami -- and Ash made sure to flaunt her ass in a tiny thong before it's, y'know ... locked down for life.

Thanks, bikinis!

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