According to a report by Radar Online, Rob Kardashian doesn't want to attend Kim Kardashian and Kanye West's wedding because of his recent weight gain. A source told the site that the reality TV star has been feeling "down in the dumps" over his weight and would prefer to skip the Paris nuptials.

"Rob is upset about his changing shape and truly feels like the black sheep of the family," a source told Radar.

"Of course, that could change. Kim is his sister," the source added. "He loves her. But he knows this will be all about Kim and as usual, Rob feels he would be like the third wheel."

The source went on to say that Rob and Kim haven't had the best relationship recently because she's so critical of his weight.

"Deep down, she thinks he is a total sucker and it's very hurtful to Rob," the source claims. "Out of all the Kardashian kids, Rob is the most down to earth and level headed. But he is just trying to find his way in the world."

There were rumors that Kris Jenner told Rob that he needed to drop 70 pounds before Kim's wedding. A source told the National Enquirer that he was considering stomach stapling surgery in order to meet the weight loss deadline.

"This procedure is a major operation," the source said. "But being the ugly duckling in the family has affected Rob deeply. Everyone's worried about him."

Rob isn't the only one who is reportedly thinking about skipping the wedding. According to VH1's "The Gossip Table," Beyoncé and Jay Z are hesitant about going because they know cameras will be there.

It's been rumored that Kardashian and West are allowing E! cameras to film the wedding for an upcoming episode of "Keeping Up With the Kardashians."