Britney Spears does the splits in teeny workout ensemble: 'Back at the gym!'

Oops ... she's doing it again!

Britney Spears took to Instagram on Sunday night to show off her incredibly fit physique as she put in the work (b-tch!) at the gym. Wearing a bright pink zip-front sports bra and teeny gray gym shorts, Spears looked absolutely incredible as she takes a couple of mirror selfies ... including one of herself doing the splits!

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"Back at the gym," she captioned the Instagram slideshow. "Stretch and run all the way."

The sultry selfies show off Britney's six-pack abs, toned arms and extreme flexibility, which are things that she has put on display on Instagram before. The singer has gotten into increasingly good shape as she continues her Las Vegas residency Piece of Me, which will end later this year in December.

Spears posted the selfies just one day after stepping out for the 2017 Radio Disney Music Awards with her two songs and sister, Jamie Lynn. She was honored with the Icon Award at the fun-filled ceremony, and she looked absolutely incredible in a skintight black dress with one major cutout.

Check out Britney Spears -- and more stars -- at the Radio Disney Music Awards:

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