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Ashley Tisdale

Instagram

Ashley Tisdale is working it out!

The actress, who is known to post selfies, added a healthie of herself at the gym to her Instagram account on Wednesday, Sept. 18.

In the fun snapshot, the 28-year-old former High School Musical star is standing in front of a mirror, proudly holding up her phone and flashing a peace sign in front of the equipment.

The Disney alum looks like she is ready to exercise, wearing a crossbones smiley face tank top, leggings, red sneakers, sunglasses and a beanie.

The 28-year-old's caption is short, but to the point: "Gym rat #ubetterworkbitch"

A (subtle) hint that she is listening to Britney Spears' "Work Bitch"?

Could the blond beauty be stepping up her fitness to prepare for her upcoming wedding? Tisdale got engaged to beau Christopher French in NYC in August.