Rob Kardashian Nixes Possible ‘Biggest Loser’ Gig; 'KUWTK' Star's Struggles With Weight Gain And Cara Delevinge’s ‘Rejection’ Not Enough Motivation?

Rob Kardashian has been battling weight gain, and also his alleged request for a date with Cara Delevingne that was spurned, but that's apparently not enough to accept an offer from "Biggest Loser," new rumors suggest.

"Rob didn't want to humiliate himself," the source told In Touch Weekly.

Reportedly, "KUWTK" matriarch Kris Jenner is not too happy about how Rob Kardashian is trying to shed off some pounds on his own even if his weight gain continues despite his previous efforts.

"She's been begging Rob to go public with a splashy weight-loss campaign but Rob wants to keep a low profile [and avoid] the embarrassment of it all," the report claimed.

The insider added, "Rob's tried to lose weight with exercise and clean food but he doesn't have the willpower."

His weight gain has landed Rob Kardashian more trouble than he would like. Earlier, it was rumored that the sock mogul asked Cara Delevingne out on a date but was rejected. It was also reported that he will no longer have regular paycheck from the "KUWTK" if he continues to shy away from the limelight.

Rob Kardashian's decision to "hide" as a result of his weight gain could be a problem because as TMZ alleged, "Rob will only get paid per episode if he ends up on the show at all."

There was also the report from tabloid Star magazine, per In Touch Weekly, that Rob Kardashian allegedly sent Cara Delevingne a lot of text messages asking her out.

"He's been bombarding her with text messages, and it's creeping her out," the source said. "She's not attracted to him at all and is pretty insulted that he would think he had a chance."

Cara Delevingne is friends with Rob Kardashian's half-sister, Kendall Jenner who is slowly making a name for herself in the modeling world.

"He's still in a downward spiral," the magazine said of Rob Kardashian's weight gain. "He's so lonely and desperately wants to find the right woman, but his confidence is at rock bottom. He really wanted Cara to like him."