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Ashley Tisdale -- The Skimpiest Bikini

10/4/2010 6:00 AM PDT BY TMZ STAFF

It was 96 degrees in Vegas this weekend -- and Ashley Tisdale adapted to the heat by throwing on the tiniest bikini she owns.

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Our friends at OfficialImage.com caught the "Hellcats" star takin' a dip at Wet Republic at the MGM Grand ... right around the time Avril Levigne was celebrating her 26th birthday.

FYI -- Avril was sans her kinda-sorta-maybe boyfriend Brody Jenner.

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