The reality star is using his Instagram as a motivator.
Rob Kardashian addresses what we already knew. He's gained weight.
Using his haters as a motivator, the Keeping Up with the Kardashians star posted a few flashback photos to Instagram on Tuesday where he's showing off his fit physique. "Last throwback of the day and yes I'm fat now so y'all haters can literally suck d**k," one caption read.
PHOTOS: Shocking Celebrity Weight Loss Transformations
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But that wasn't the last throwback pic posted. He later wrote: "Last throwback of the night before I go play some fat boy ball!! MOTIVATION."
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This isn't the first time Rob has addressed his weight on social media. In May 2014, the 27-year-old reality star noticed on Twitter that he was trending "for being fat."
VIDEO: Kim Kardashian Finally Explains Why Rob Left Her Wedding
"And to the blogs saying I went to fat camp or rehab LOL then why am I still fat u fools?? Y'all must have run out of real news," he tweeted. "First, I don't believe in rehab or therapy or anything of that sort and second I'm a grown man and will work on myself when I choose."
The rant continued: "I'm aware that I'm fat that def ain't a surprise to me lol and my only therapy will be in the gym anyways had to say somethingggggggggg."
Meanwhile, a number of other men have slimmed down in Hollywood, with The Hangover star Zach Galifianakis being the most notable. See their transformations, below.