Britney Spears was sporting a rather glitzy ring on her engagement finger as she left a gym in Thousand Oaks, California on Thursday (08.01.15). The ‘Gimme More’ hitmaker sparked rumours she may be set to walk down the aisle for the third time, with boyfriend Charlie Ebersol, which might be why she is determined to get into shape for 2015 as she flashed her toned tummy following her workout.