Former star of "The Hills" Kristin Cavallari hit the runway in one fragile ensemble last night: A glass bikini!

The 24-year-old reality TV star showed off her amazing body during the Diesel show at Mercedes-Benz Fashion Week Swim at Raleigh Hotel in Miami -- where she wore a bikini inspired by SKYY Vodka.

"Getting ready for the @DieselUSA and @SKYYVodka fashion show in Miami, so excited to wear the first glass bikini," she tweeted before the show.

We're guessing her fiance Jay Cutler, who was in the house, enjoyed the show.

Check out Kristin's runway strut -- plus more hot model pics!

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