Wish Britney Spears a Happy Birthday (and Holiday) With The Fitness Marshall

By Dominique Michelle Astorino

Updated on 12/25/2017 at 3:10 PM

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Merry Britmas, y'all! It was the queen of pop's 36th birthday recently, so The Fitness Marshall decided to celebrate in style (and in the holiday spirit, of course) with this total Christmas throwback (and, honestly, one of Britney's best songs). This is sure to get you in the spirit, feeling good, and sweating profusely.