Rob Kardashian shared a throwback photo on his Instagram as the "Keeping Up with the Kardashians" star slammed "haters" for constantly criticizing him regarding his weight gain.

The black and white photo was posted on Rob Kardashian's Instagram over the weekend showing the "Keeping Up with the Kardashian" star flexing his bicep in front of the camera. It was "liked" by 79,000 people as of this writing.

Rob Kardashian captioned the image, directly addressing he weight gain reports: "Last throwback of the day and yes I'm fat now so yall haters can literally suck d*ck."

One user commented: "you are a person TODO That deserves the best in the world you should not care what other people think of you kisses."

Another wrote: "You were hot then and you're STILL Hot now Girls would kill to be with you!!! Keep ya head up homie @robkardashian."

Another user added: "Why does anyone care about your weight? It's pretty disgusting that ppl would make negative comments about someone else's appearance. Just do you, there's no need to bother with other ppls opinions. As they say.. keep calm and carry on. :)"

A report from Hollywood Life said that Rob Kardashian has been depressed for over a year now because of his weight gain, which is allegedly already affecting him mentally, physically and emotionally.

His weight gain was also cited as the reason why Rob Kardashian dropped out of "Keeping Up with the Kardashians."

"He's been trying to drop about 50 pounds for a while now, unfortunately he just can't keep it off," it said. "His weight affects his mood and then his mood affects his motivation to eat well and work out. It's a vicious cycle."

Also, the source said that "Keeping Up with the Kardashians" star Rob Kardashian is fully aware that his weight gain has been feasted on by the tabloids, so the "last thing he wants to hear is other people giving him a hard time about it. That's why he lashed out!"