Guess Which Sexy Celeb Sported This Stringy Black Bikini

Thirsty Thursday is comin' in hot with this Hollywood hottie -- can you guess the sexy star who put her summer bod on full display in these beachside selfies?!?

She recently posted her Hamptons/London vlog -- featuring lots of Alix Earle content.

If you're still scratching your head, take it up with her other bestie, King Kylie!