Rob Kardashian's battle with fat prompted the "Keeping Up with the Kardashians" star to fly his own trainer ahead of Kim and Kanye's wedding. The sock mogul's weight gain, meanwhile, is not an issue with sister Khloe Kardashian.

According to TMZ, Gunnar Peterson, a famous celebrity trainer, will fly to Paris so he can help Rob Kardashian's battle with fat from Friday up to Monday. The trainer said he and the momager's son have been training five times a week except beginning two weeks ago when they had to cut back because of "other commitments."

"I'm the gatekeeper of Rob's workouts, not the gatekeeper of his life," he told TMZ.

Meanwhile, per MailOnline, Rob Kardashian took to Twitter to address his weight gain. "so i found out i was trending for being fat...thank you all it really made my day."

Then he added: "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."

"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."

Then Khloe Kardashian joined in the conversation as she defended Rob Kardashian's battle with fat by starting off with a tweet that said: " love you @robkardashian."

Then she addressed the other haters by tweeting: "Some of you people are disgusting for calling others names and picking on them."

"You should be ashamed of your self. Your words are cutting deeper then you know and are possible leaving lifetime scars! What shallow souls some of you are. Its sickening to critique anyone off of their appearance. Grow up!"