Lindsey Wixson is one of the biggest new runway models out there -- but she's building a new reputation as one of the most unstable too!

The 17-year-old stunner hit the catwalk for the Versace show over the weekend in Milan, where she toppled over while wearing an uber-tight gown and some crazy high-heeled shoes.

While it's always funny to watch a model fall, this one was dangerous for Lindsey, who tweeted "Sprained ankle :(" the morning after her accident.

This isn't Lindsey's first fashion fiasco though -- she also fell three times back in May during a runway show for Naomi Campbell. Re-watch that trip below.