Jared Leto Hops on Yacht with Bikini-Clad Hotties in St. Barts

Jared Leto's surrounded by a throng of bikini-clad women on a Caribbean island ... and it's pretty clear he's the straw stirring the drink.

The "30 Seconds to Mars" frontman was cruising on a yacht Wednesday in St. Barts with a bunch of very eye-catching friends ... including several women in bikinis and some ripped dudes. It's in the 80s down there -- like always -- so they're feasting on some Vitamin D.

Jared and co. came ashore to stroll the perfect white sand beach and snorkel in the crystal clear waters.