TAKIN' A CHILLY DIP
Forget the Polar Express, Livvy Dunne's opting for the Polar Plunge this Christmas Eve ... taking a freezing ocean dip in nothing but a tiny bikini!!
The LSU gymnast performed the impressive feat in 32-degree weather just before Santa Claus came to her town ... and fortunately for all of her followers, she filmed the whole thing.
Dunne -- wearing a red two-piece -- took to the water like a champ ... and dove head first into the icy aqua, before she raced out to grab a warm towel.