Kylie Jenner and Timothée Chalamet’s Mexican vacay is heating up fast … the lovebirds hit the waters in Cabo, with Kylie ditching the layers and rocking just a bikini top!

Check the pics — Kylie was serving full heat in a skimpy black swim top, kicking back on a private patio Monday, scrolling on her phone while lounging with Timothée … who clearly earned this vacay after snagging that Oscar nod for “Marty Supreme.”

The pair have been together since 2023 — and judging by this trip, they’re fully in their groove, carving out some low-key solo time to recharge, reset, and keep the romance smooth.