Arianny Celeste and Bombshell Friends Feelin' Blue in Bikini Photo Shoot

It's always great when Arianny Celeste throws on a bikini and hits the beach ... but the UFC star brought her equally hot friends along for a sexy shoot ... and TMZ Sports has the pics!!!

The Octagon girl G.O.A.T. -- along with Dessie Mitcheson and Kayla Fitz -- hit up Malibu for some fun in the sand ... wearing matching blue bikinis and yellow earrings.

The shoot is part of the summer campaign for Celeste's Girlfriend Box business ... and who better than Arianny herself to show off the product!!!