In the film, an aspiring dancer in Miami befriends an innovative flash-mob dance crew and helps them stage a footloose protest in order to save their neighborhood from a greedy developer.
Former "High School Musical" star Tisdale looked pretty in a short, white strapless dress with strappy black sandals. She added some flair to her blonde hair by dipping the tips in purple dye.
The actress celebrated her 27th birthday earlier this month.
See more photos of Ashley...