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Zac Efron, Ashley Tisdale

Albert Michael/startraksphoto.com

So True So False, STSF

Vanessa Hudgens isn't going to like this.

High School Musical starlet and Hudgens' BFF Ashley Tisdale rang in her 26th birthday this weekend with the help of family and friends. Guests couldn't take their eyes off a certain guest who seemed to give Ms. Tisdale a little extra birthday affection at her Malibu beach bash.

The birthday gal was photographed getting super flirty with none other than HSM costar (and Hudgens' ex!), Zac Efron.

But are these two more than just friends? This rumor is...

So false!

The 26-year-old singer shared her excitement about reuniting with her longtime pal when she tweeted, "So happy zacary made it to my party!!! He's my brother/best friend!!!" But despite the smooching photo and piggyback rides, this duo isn't romantically involved.

A source close to the costars claims that feelings are strictly platonic between the two. "They are good friends and have been for years. Ashley is dating Scott Speer. He was also at the party."

Guests at the beachy bash enjoyed Heineken Light and VnC cocktails at the party...should we blame the BFFs' PDA on the alcohol?