Last week, Rob Kardashian took to Instagram to post throwback photos of himself looking lean and fit as his way of defying critics that have called him fat, Entertainment Tonight reports.

"Yes I'm fat now so yall haters can literally suck d**k," Kardashian captioned one of his photos.

Check out Kardashian's Instagram photos below.

 Last throwback of the day and yes I'm fat now so yall haters can literally suck dick

A photo posted by ROBERT KARDASHIAN (@robkardashian) on Feb 5, 2015 at 6:10pm PST

Although Kardashian claims to have "haters" who call him fat, he later posted a photo of fans flirting with him and supporting his now chubbier frame.

Prior to his throwback Instagram rant, Kardashian took to Twitter last year to also comment on his heavyset frame.

At the time, TMZ released photos showing off Kardashian's weight gain and published a story claiming that the reality TV star was in the gym to look leaner for his sister Kim Kardashian's wedding with Kaye West. TMZ reported that Kardashian flew in his trainer Gunnar Peterson to Paris so that he and his sister, Khloé Kardashian, could train in the gym before the grand "Kim-ye" wedding that took place last May. Additional reports also claimed that Kardashian had admitted himself into fat camp to lose weight.

Kardashian responded to those reports with a Twitter rant denying rumors that he had gone to fat camp or rehab. He explained that he doesn't believe in rehab and would lose the weight when he felt ready.

"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," Kardashian tweeted.

"I'm aware that I'm fat that def aint a surprise to me lol and my only therapy will be in the gym anyways had to say somethingggggg," he added.

Kardashian's tweets from last year have since been deleted.