Livvy Dunne Claps Back at Haters With Sexy Bikini Shots ... Ciao Bella!

Livvy Dunne is DONE with the haters ... the gymnast is on a lavish vacay in Italy and clapped back at her mega-following with hot bikini shots!

Check it out ... the gymnast and "Sports Illustrated" model posted a series of sexy selfies from overseas ... but continued to heat things up with a handstand post on a paddleboard ...

"Never have seen my haters doing a headstand on a paddle board in the Mediterranean" -- the 23-year-old called out the trolls trashing her for taking her looks, skills and success to TikTok ...

Livvy is credited as one of the first college athletes to capitalize on her name, image and likeness on a massive scale, and clearly she's owning IT ... as she should!