Rob Kardashian had a heated confrontation with brother-in-law Lamar Odom amid allegations that the NBA star has been cheating on his wife,Khloe Kardashian, RadarOnline.com is exclusively reporting. 
 
 Khloe’s younger brother has been living with the couple on and off for several years in their Calabasas, Calif. mansion and after the latest round of reports that Lamar had cheated on Khloe, “Rob confronted Lamar and it got heated very, very quickly. Rob and Lamar have been close since he came into Khloe’s life,” a family insider told Radar. 
 
 “When Rob asked Lamar point blank if he had cheated on Khloe with criminal defense attorney, Polina Polonsky, he refused to answer the question. Rob grew angrier that Lamar didn’t respond, and he ended up just leaving the house. A lot of people bash Rob, but he truly has his sister’s back, and is very protective of her.” 
 
 The reality TV starlet kicked cheating Lamar out of the marital residence, “after the most recent reports about Lamar’s affair with Polina became public. Khloe and Lamar are talking daily, but he isn’t allowed back in the house,” an insider said. 
 
 PHOTOS: Celebs Who Have Slammed The Kardashians 
 
 “Rob has been continuing to stay with Khloe, and has been a big source of support for her at this very difficult time.” 
 
 As Radar has serialized, the NBA power forward has been accused of sleeping with at least two women over the last year: Most recently, Polina, who claims she had a brief affair beginning on June 2, the day of Kim Kardashian‘s baby shower. 
 
 Worryingly for Lamar and Khloe, Polina passed a lie detector test! 
 
 Meanwhile, Rob recently went to a Los Angeles Dodgers game last week with older sister Kim’s baby daddy, Kanye West. However, when Kanye was shown on the jumbo screen at Chavez Ravine, the crowd erupted in boos. 
 
 PHOTOS: Khloe Kardashian With Lamar Odom At The Hilton Garden Inn 
 
 Over the weekend, the Kardashians and Jenners celebrated youngest sibling Kylie Jenner‘s 16th birthday with another party. 
 
 Noticeably absent: Lamar. 

 Khloe & Lamar Separated 
 
 Khloe Kardashian and Lamar Odom -- SEPARATED 
 
 EXCLUSIVE 
 
 andare separated, but neither has taken any step toward divorce ... sources tell TMZ.Multiple sources familar with the situation tell us Khloe "effectively" declared separation when she threw Lamar out of the house Wednesday, after he refused her attempt at an intervention. TMZ broke the story ... Lamar has had a crack addiction problem for at least 2 years, and Khloe simply couldn't take it anymore.We're told Khloe made it clear if Lamar did not get help -- the point of the intervention -- she wanted nothing to do with him anymore.But we are also told neither Khloe nor Lamar has consulted a divorce lawyer ... at least not yet.If and when they do file for divorce -- which we're told is likely -- there won't be much to fight over. Sources connected with the Kardashians tell us the couple signed a hard-fought prenup before they married.We're toldwas right in the middle of the prenup battle because she wanted to protect her daughter -- who tied the knot after a 4-week courtship.Short story ... the fat lady hasn't sung yet, but she's warming up. 

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– Things are not looking good for Khloe Kardashian and Lamar Odom. TMZ reports today that they're separated, though not taking steps toward divorce just yet. That comes after a breathless report yesterday that Lamar "vanished" and had been MIA for almost three days, after Khloe kicked him out of their house Wednesday. The problem: Odom's crack addiction, which Kardashian has been keeping a secret from her family for years, the gossip site says. Things apparently came to a head when Khloe tried to stage an intervention and Lamar wasn't having it. Odom has reportedly been struggling with addiction for at least two years, and made one attempt at rehab but only lasted three weeks. Sources say things got really bad after basketball season ended and he became a free agent, and when he took off last week, his family and friends worried he might be hiding out somewhere binging on crack. Over the years, sources say Khloe has even hired private investigators to follow Lamar, but she told them she was simply concerned about him using performance-enhancing drugs. It wasn't until recent reports surfaced that Odom was cheating that she finally told her family the truth, sources say.