12/01/2010 05:12 am ET | Updated May 25, 2011

Britney Spears Goes Backless At The Gym With Her Son (PHOTOS)

Britney Spears and her son Jayden James Ferderline are gonna work it on out!

The Circus singer and her four-year-old put in some time at a kiddie gym in Los Angeles on Thursday, getting some exercise and looking extremely cute while doing so. While Jayden opted for a Batman T-shirt accessorized with a fake tattoo on his neck, Brit-Brit went with a black backless number that brought a little glamour to the workout.

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