While Rob Kardashian struggles with losing weight, he is rumored to also have an addiction to marijuana and "sizzurp."

Rob Kardashian Skips Kim Kardashian's Wedding To Avoid Taking Pictures?

An insider close to the Kardashian clan revealed to TMZ Wednesday that his family is extremely concerned not only for his health but his struggle with drugs. The Kardashians apparently know about Rob's addiction. He recently attended a drug infested party that lead to pictures going viral on the web. In one picture, he is sitting at a table with two cups. One reads, "Codeine Boys" while another says, "SipLean."

Word is that he also smokes marijuana. His family is urging him to check into a rehab facility but he refuses to go. Now, the family is said to hope that the pictures surfacing on the Internet will encourage him to get help.

Kris Jenner Speaks On Rob Kardashian's Weight Issues

To make matters worse, Rob is said to be on the outs with his sisters Kim and surprisingly Khloé. Apparently he has not spoken with them since he was MIA at Kim's wedding to Otis rapper Kanye West on May 24.

An insider told Radar Online, "[Kim] hasn't bothered to even attempt to talk to him since returning from her honeymoon [while] Khloé has sent him text messages and left him several voicemails. Rob hasn't returned any of Khloé's phone calls or texts. He feels completely estranged from his sisters and family. He really isn't in a good place."

Rob has yet to respond to speculation about drug use and his status with his famous sisters. But he did take to Twitter to shut down rumors that he has his own reality show in the works.

He wrote June 20, "To the blogs saying I'm going to do some TV show, that is completely false. only show I am doing is my Family's show. Another lame story."

Tags: Rob Kardashian Weight Gain Rob Kardashian Weight Loss rob kardashian