The 28-year-old has been battling social anxiety and depression, withdrawing himself from the public eye completely over the last year.
His family have been begging him to seek professional help, and earlier this year his older sister Khloe, 30, broke down while discussing his problems.
Now it’s been alleged that Rob is at the Palm Beach centre, and source told Gossip Extra: “Rob is in good spirits and has a positive mindset. He quietly checked into a beachside Palm Beach County drug and alcohol in-patient rehab centre over the weekend.”
During a previous episode of the family reality show Keeping Up With the Kardashians, Rob’s mother Kris expressed her fears that he would die.
She said: “If I don’t help him do something drastic, he’s going to die. He was someone who was very athletic and he’s gained over 100 pounds in the last year.
“I’m just waiting for this horrible thing to happen and there’s nothing we can do about it.”
But Rob’s close friend and celebrity bodyguard Mark Behar thinks rehab is the best place for him.
Mark said: “Rob will probably lose 10 to 20 pounds within the first few weeks by just being in rehab and daily programs relating to his detox.”