With the success of Britney Spears' latest album, Glory, which debuted at No. 3 on the Billboard charts a few weeks ago, the enduring pop icon has a lot to be happy about.
Perhaps that's why she put on some Meghan Trainor and busted out more steamy dance moves in nothing but a sports bra and spandex workout shorts. (Watching her work out is a joy in its own right.) Or maybe she just knows that she's insanely hot... that alone is enough reason to break out in a happy dance.