Britney Spears Flaunts Enviable Abs in Selfies at the Gym -- See the Pics!

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Instagram

Heading to the gym is work and play for Britney Spears!

The 35-year-old singer took to Instagram on Tuesday to share selfies of her rock-hard abs. 

"????," she captioned a slideshow of pics of herself sporting tiny purple shorts and a blue sports bra.

Spears definitely works hard in the gym -- and has the Instagram posts to prove it.

While the mother of two couldn't be in better shape, she's not immune to wardrobe malfunctions. Watch below.