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Britney Spears proves once a Disney girl, always a Disney girl when she wore an inside-out Mickey Mouse shirt!

Supporting her Disney roots, Mama Spears wore a Mickey and Minnie shirt for a trip to the gym in Westlake, Calif., on Tuesday. After going from blonde to brunette earlier this month, Britney dyed her locks a lovely shade of chocolate cherry a few days ago … and we aren't sure if we are digging the new color.

Armed with a sugar free Red Bull, the sultry singer took to the gym in the mouse-tastic t-shirt and velour sweats.

BritBrit has a storied past with Disney. The pop star, along with Christina Aguilera, Justin Timberlake, Ryan Gosling and many more, was on the New Mickey Mouse Club in 1993.

When not on stage during her Las Vegas residency, the mother of two is mostly photographed in off-duty ensembles. The 32-year-old is known for picking comfy over couture -- and given how hard she is working on her non-stop performances -- we can't blame the gal on the go!