The 'High School Musical' star, who's become quite the YouTube sensation lately, takes on Britney's classic.
Barbra and Donna. Brandy and Monica. And now, Ashley and Vanessa.
From high school drama queens to straight-up murderers, these onscreen mean girls are as fun to watch as they are cruel.
It's been 10 years since we saw the Wildcats dancing their way through the halls of East High School. See how the 'HSM' cast have all grown up.
13 times artists including Katy Perry, 50 Cent and Hilary Duff didn't match the backing track.
Demi Lovato, Avril Lavigne, Ashley Tisdale and Chinese pop star G.E.M. will star in an upcoming musical comedy together called Charming.
Ashley Tisdale is the latest celeb to dye her hair purple, opting for a light lilac shade at the ends of her locks.
We've gathered up some of the cutest and most sentimental Throwback Thursday pics stars shared this week.
Ashley Tisdale is now a married woman!
It was an amazing night for 'High School Musical' superfan Camilla Simon, who won a contest to dine with members of the cast!
Cast members Ashley Tisdale, Vanessa Hudgens, Monique Coleman, Corbin Bleu, choreographer Chucky Klapow and director Kenny Ortega from the first 'High School Musical' were all smiles as they joined Simon for a special evening on Saturday, Aug. 30.