Kathy Griffin knows how to make people laugh – and now she knows how to make ‘em sweat!

The svelte comedienne gave fans a peek at her rockin’ bod in a new Instagram photo.

The 53-year-old, who’s dating 34-year-old Randy Bick, showed off her slim frame in a sexy black bra before hitting up Jimmy Kimmel Live! Wednesday night.

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“Ohhhh just getting ready for @jimmykimmel!” wrote the funny lady, who took the photo during a wardrobe change.

kathy griffin

Kathy with Randy

Kathy has been very open up about her past struggles with bulimia early on in her career.

“I would binge, and then I would starve myself,” she told Rosie O’Donnell on OWN’s The Rosie Show in 2012.

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But these days, she’s in a much better place and is focused on staying fit the healthy way — by dieting and exercising.

And her hard work is certainly paying off!