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Leonardo DiCaprio may have the yacht, the model, and the Mediterranean sunshine ... but he looks like he was out there drowning in some serious feelings -- all while his girlfriend continued partying like it was paradise.

Catch the pics -- Leo’s yacht life over the weekend seemed to come with a side of existential crisis, staring off like he was pondering the meaning of it all. All that money, all that luxury ... and still no guarantee of a smile! Backgrid

Leo went shirtless and bronzed, arms crossed as he stared at the floor, then off into the distance -- and it was hard to tell if he was deep in thought, zoning out, or just plain tired.

But Leo’s GF Vittoria Ceretti was on a whole different wavelength -- stunning in a tiny black string bik

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