Trying to keep her body in concert-ready shape, Katy Perry went to the gym in Los Angeles on Wednesday (April 17).

The "Firework" singer wore a white tank top, black workout tights, and black sneakers as she nibbled on her nails on the way back to her car.

Recently, the 28-year-old joined with other famous females to support Gucci's A-List Chime for Change campaign, promoting women's education, health, and justice.

Speaking about the power of social media, Ms. Perry said, "If I feel strongly about something, the whole world will know within seconds."