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California girls, they're unforgettable.

Vanessa Hudgens and Ashley Tisdale celebrated Memorial Day in true California girl style ... with barbecue and bikinis. The former Disney darlings bared their bods and showed off their taut tummies in swimwear. Ashley even donned Daisy dukes with a bikini on top. Judging by their Instagram photos, it's not hard to see why Ashely was voted number seven and Vanessa number nine on Maxim's Hot 100 list.

Both of the girls wore shades and bikini tops with high-waisted bottoms. Ashley donned a red and white striped bandeau and white denim shorts, while Vanessa sported a pattered bikini and matching kaftan with a black maxi skirt and a black trilby.

The girls, who first met on the set of High School Musical back in 2005, refer to one other as their "twin sister."

Although they're often in the running for the same roles, Ashley told Us Weekly that she never competes with her BFF.

"I call her my twin sister," Ashley told the mag. "She's always there for me. Some people are really competitive; we're not. We're really supportive of each other. You don't find that a lot in this business."

Vanessa also said that their friendship is invaluable.

"We were never competitive in any way, shape or form," Vanessa concurred. "We completely understand each other. She's a lot of fun, and she's just grounded."