Chelsea Handler knows exactly how to shut an ex-boyfriend up, and that's with a sexy bikini photo.

Last night, the 40-year-old former talk show host posted a photo of herself in a black-and-white striped bikini top with pink bottoms to her 1.9 million Instagram followers to get back at an old boyfriend who criticized her body, which is absolutely crazy considering she's currently in amazing shape.

"You know, I had a boyfriend who told me my boobs were too big and that I was fat," she cleverly wrote. "And then, I looked in the mirror."

Handler is the farthest thing from shy when it comes to her body, and she has an Instagram full of topless photos to prove it. Back in April, she was even photographed butt naked on the cover of Esquire magazine with Nick Offerman, according to Us Weekly.

It is unclear which ex she is referring to in this specific post, since she's had a few high-profile relationships, including, 50 Cent, Andre Balazs and Ted Harbert, but whoever it is will be sorry they ever called her fat after seeing her toned tummy.

Just last year, she opened up about her body and how she really feels about people who "fat shame." She may not have many boundaries, but when it comes to fat-shaming, she does not think it's OK.

"I mean, people who aren't fat think they're fat - myself included," she told SheKnows. "I have body dysmorphia...we all have it. If you're going to be spending your time on social media, there should be, like, three criteria. It should be funny, it should be inspiring, or it should be supportive. It shouldn't be like, 'Oh, you're fat,' 'you're ugly,' 'you looked old in that.' You're supposed to look at a picture and be like, 'Oh, she looks good!' and if she doesn't shut your mouth."

See some of her revealing and carefree photos below!

 You know, I had a boyfriend who told me my boobs were too big and that I was fat. And then, I looked in the mirror.

A photo posted by Chelsea Handler (@chelseahandler) on Aug 2, 2015 at 6:32pm PDT

I'm in a detox bath that my makeup artist gave me which may or may not cause diarrhea. Tune in Tokyo. A photo posted by Chelsea Handler (@chelseahandler) on Jun 23, 2015 at 6:53am PDT

 Dear God- Tomorrow night I will be on Seth Meyers' show at 12:30am, nbc. Pls guide me toward the light.

A photo posted by Chelsea Handler (@chelseahandler) on Apr 28, 2015 at 6:15pm PDT

I finally got naked for a professional reason. I don't know why Khloe and Kim had to steal my ass. A photo posted by Chelsea Handler (@chelseahandler) on Mar 24, 2015 at 10:58am PDT

I'm a Kardashian' A photo posted by Chelsea Handler (@chelseahandler) on Aug 14, 2014 at 12:17am PDT

 You can watch my 4th of July booby bonanza on Twitter.

A photo posted by Chelsea Handler (@chelseahandler) on Jul 4, 2015 at 10:02am PDT

Getting ready for my final shower scene. August 26th is the one hour finale. Orange you glad I told you? A photo posted by Chelsea Handler (@chelseahandler) on Aug 13, 2014 at 1:24pm PDT