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Vanessa Hudgens is baby bumping in her bikini ... along with her bestie!

Check out the actress' latest Insta post -- she's all smiles as she shows off her round belly on the beach with her best friend, who's also preggo. Instagram / @vanessahudgens

Vanessa is giving off mermaid vibes with her long, curly hair cascading down her back while dressed in an adorable floral print 2-piece.

We last saw the "High School Musical" star showing off her pregnancy glow about 2 weeks ago while she dined at The Henry in Phoenix. She was out and about with her firstborn -- dressed adorably in a Halloween-themed onsie -- and had her belly on display in a blue crop top. TMZ.com

She announced she was expecting her second baby with husband Col

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