The Weeknd & Selena Gomez Show Mad PDA on Expensive Yacht

The Weeknd and Selena Gomez prove swapping spit with class is possible ... on an expensive ass luxury yacht!!!

The "Starboy" singer and Selena got hot and heavy over the weekend on the Leight Star yacht ... docked in Marina Del Rey, CA. Renting the boat ain't cheap -- a week's worth runs around $85k.

So much for their relationship hitting the skids.