Workin' up a sweat on stage, Selena Gomez performed a concert at the Eventim Apollo in London, England on Saturday (September 7).

The "Come and Get It" singer wore a white T-shirt revealing her black brassiere underneath and black leather hotpants as she worked the UK crowd. See her perform "BEAT" and "Round & Round" in the videos below.

Though she's busy on her Stars Dance tour, the 21-year-old is pulling double duty, also promoting her new film, "Getaway."

In the action flick currently in theaters, Selena joins Ethan Hawke as he struggles with a mysterious villain to find his kidnapped wife.