Rob Kardashian reportedly has his family worried because of an alleged drug problem. According to TMZ, the 27-year-old sock designer has been doing sizzurp and weed and recently attended a drug-fueled party at a friend's house.

Reportedly, the Kardashian family is trying to get him to check into rehab, but Rob is refusing to go.

"You can see Rob holding a double cup... the container of choice for Sizzurp. The cup on the table actually has the words, 'Codeine Boys' emblazoned on it. He's also seen smoking weed," TMZ wrote, including two pictures from the party.

A source close to the family told the site that Kardashian's have already started calling different rehab facilities and hope the leaked pictures will be a wakeup call for Rob. The family also tried to get Khloe Kardashian's ex-husband Lamar Odom to check into rehab for his alleged drug addiction.

There was recently a report by Radar Online claiming that Rob hasn't spoken to his sisters Khloe and Kim Kardashian since Kim's wedding to Kanye West last month. The lone male Kardashian did fly out with the rest of the family to attend pre-wedding events in Paris, but reportedly got into a nasty fight with  Kim the night before the ceremony and left.

"[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."

"Khloe has sent him text messages and left him several voice mails," the source continued. "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."

According to Radar, the fight stemmed from Kim accusing Rob of leaking nasty stories about her to the media. She also reportedly brought up his weight struggles.

"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 told the site. "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 "encouraging her kids to continue to reach out to Rob."