The Keeping Up With The Kardashians star is said to have voluntarily sought help at a treatment centre in Malibu at the weekend.
A source told People that Scott, 32, decided to get help because of his young children, Mason, five, Penelope, three, and Reign, ten months.
"He wants to make it stick this time because he has come close to losing everything," said the insider.
Scott checked into rehab at the weekend, before his former brother-in-law Lamar Odom collapsed. Ex-NBA player Lamar was found unresponsive at a Nevada brothel on Tuesday afternoon and is currently in hospital in Las Vegas. His condition is unknown but multiple reports from the US claim it is critical.
It's not known if Scott - who split from Kourtney Kardashian in July - is aware.
Scott previously checked into rehab in Costa Rica in March, staying for one week before leaving. He later said he'd only ever intended to stay one week and had always planned to return to treatment in the future.
He also sought treatment in Florida after his split from Kourtney.
The couple broke up in July after nine years together and three kids. Neither has spoken in detail about the split but it's alleged Kourtney grew tired of Scott's partying and the final straw was pictures of him hanging with another woman in Monte Carlo while she was at home in LA with the kids.
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