She gave her first UK show in five years everything, ensuring her rapturous audience left happy and satisfied.
But Britney Spears' energetic set appeared to take its toll on the star, with the hitmaker, 34, pictured looking exhausted as she left London's Roundhouse venue on Tuesday night.
Sitting in the back of a plush car, Britney still appeared to be in make-up from her show and had tied her hair in a messy updo.