Dua Lipa and Callum Turner are turning up the heat on an exotic Spanish island … all over each other during a romantic vacation to Ibiza.

The hot couple is soaking up the sun from a private perch along a rocky coast in Cala Llenya … making out above the Mediterranean waves.

Dua’s teasing Callum with a skimpy, multicolored bikini … and he’s showing off his toned muscles, wearing nothing but shorts and a bucket hat.

Callum couldn’t keep his hands off Dua … at one point, he crawled on top of her and they started smooching. Hey, ya can’t blame him … she’s smoking hot!!!

Dua’s on her annual birthday trip to Ibiza, where she’s celebrating with a big group of friends … and this year she brought her boo with her … looks like she and Callum snuck off here for some alone time.

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We’ve seen Dua and Callum getting handsy all over Hollywood since they first linked up in January … and now they’re taking their relationship overseas.