The star's longtime partner and father of her three children checked into a Costa Rica treatment centre earlier this month to address "issues" and Kourtney has said she is fully supportive of him.
Kourtney told People: "He is doing well... He is learning so much about himself and growing and so that's really amazing to see. When he's working on himself it only betters his relationship."
Scott hasn't spoken directly about what prompted him to seek treatment, but there have been rumours of excessive partying in recent months.
In a statement released 16 March, he simply said: "I realise my issues are bigger than me and I'm ready to truly remedy this struggle I continue to battle."
Kourtney spoke about Scott's treatment on Saturday, 21 March, while attending a pool party launch event in Las Vegas.
However, reports then emerged that Scott had decided to leave rehab.
According to TMZ, the reality star hopes to leave the facility after a week's stay because of his work commitments, rather than stay for the usual 21-day period. Reps for Scott and Kourtney have not commented yet.
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