Kim and Rob Kardashian reportedly argued before her wedding because she was tired of him ''moping'' around their hotel.
The 'Keeping Up with the Kardashians' star - who married Kanye West in Florence, Italy, last Saturday (24.05.14) after starting the celebrations in Paris the previous evening - also accused her brother of leaking negative stories about her and claimed he was tarnishing the family name with his recent weight gain.
A source said: ''Kim and Rob haven't been speaking to each other for months...she thinks he is lazy, and bringing down the family name because of his physical appearance.
''After arriving in Paris, Rob and Kim got into a very heated argument because she thought he was just moping around the hotel. She encouraged him to go out and sight see, which he declined to do.
''This made her extremely angry, and they exchanged words. During the course of the argument, Rob was accused by Kim of leaking negative stories about her to the press. That was the final straw for Rob, because that is something he would never do.''
Following the argument, Rob refused to attend the wedding - which he felt was ''over the top'' and flew back to Los Angeles.
The source added to RadarOnline.com: ''So, he packed his bags, and left Paris before the wedding. He wanted nothing to do with it, and thought it was ridiculous that Kim's third marriage was so over the top.''
While Rob is said to have vowed to get back into shape, friends fear his problems will only escalate further if he doesn't have the support of his family.
A source said: ''The last thing Rob should be worried right now is about his weight....it's just a symptom of his problems. He is clearly struggling and needs the support and love of his family. Judging him, making snarky comments about his weight, and so called lack of ambition isn't helping.''
The BBC drama starring Aidan Turner returns to BBC One on September 4th.