Leo DiCaprio Booze, Boobs & That Beard In Private Island Bash

1/2/2015 12:08 PM PST

Leonardo DiCaprio ran an experiment on New Year's Day -- can a guy with the beard of a homeless dude get a bunch of chicks to party with him in St. Barts?

You can see the results of Dr. DiCaprio's testing in these photos. Go ahead and click through the gallery -- he gathered a lot of evidence. Very hot evidence.

Leo shuttled a bunch of chicks -- half a dozen or so -- to a private beach only accessible by boat to celebrate 2015. While he smoked a vape pen and took in the scenery ... a staff of 5 served Leo and co. from a full bar on the beach. 

Even for Leo ... this is one helluva party.