There's a bit of family drama going on with the Kardashian kids. According to Radar Online, Rob Kardashian hasn't spoken to his sisters Kim Kardashian and Khloe Kardashian in a month. A source told the site that Rob reportedly stopped speaking to them following a blowout at Kim's wedding to Kanye West in Italy.

The 27-year-old sock designer did fly out to Paris for pre-wedding festivities but bailed on the actual ceremony because he got into a nasty fight with Kim.

"[Rob] has no reason to talk to Kim," a source told Radar, as "they haven't been on good terms for a very long time."

Reportedly, the newlywed isn't ready to patch things up and hasn't tried to reach out to Rob.

"Khloe has sent him text messages and left him several voice mails," the source told Radar. "Rob hasn't returned any of Khloe's phone calls or texts. He feels completely estranged from his sisters and family. He really isn't in a good place."

The source claims that since the wedding drama, Rob barely leaves his house and won't return phone calls from his concerned family members. According to Radar, the fight at the wedding stemmed from Kim accusing her brother of leaking negative stories about her to the media.

The 33-year-old also reportedly brought up Rob's struggle to lose weight.

"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," the source said. "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," the source added.

Momager Kris Jenner is well aware of the sibling drama and is said to be "extremely worried about" Rob because "she knows he isn't in a good place."

"[Kris] is encouraging her kids to continue to reach out to Rob," the source told Radar.