Rob Kardashian has hit back at trending ‘fat’ jibes aimed at his weight gain.

And his big sister Khloe is with him every step of the way!

Rob made a rare appearance at an LA airport on Sunday to fly out to Paris for sister Kim’s wedding – and his name has been trending on Twitter ever since.

But for all the wrong reasons!

Twitter trolls have posted countless nasty comments about the reality TV star’s appearance, with some saying he should be “ashamed” of the way he looks.

“so i found out i was trending for being fat… thank you all it really made my day :)” Rob tweeted.

He continued, “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

“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 somethingggggggggg,” he wrote.

Never one to mince her words, protective sister Khloe took to Twitter to defend her little brother.

“You should be ashamed of yourself. Your words are cutting deeper than you know and are possible (sic) leaving lifetime scars!” she wrote.

“What shallow souls you are…Grow up!” she added.

The 27-year-old’s weight gain has skyrocketed to a reported 260 pounds, with momager Kris Jenner pleading with her son to get help after doctors told him he was at high risk of developing diabetes and eventual organ failure.

Let’s hope Rob finally gets the help he needs!