bikini shorts legs ocean malibu puppy flirt justin bieber Ashley Tisdale Malibu birthday twenty-seven Selena Gomez

Selena Gomez may have been celebrating Ashley Tisdale's 27th birthday in Malibu, but the songstress couldn't help but clown around with a pal in the sand.

Even though we have a feeling the two are just friends, seems like that boy is getting a little frisky with Justin Bieber's ladylove. Watch out!

Selena's beach style is adorable ... cropped lime green tank with a peace symbol, tiny white denim shorts and a long, fuzzy sweater. Easy and breezy, indeed.

See more of her kickin' it in the sand in our gallery below.