But a source close to Kourtney tells ET that the 36-year-old Keeping Up With the Kardashians star actually isn't bothered at all by Scott's much younger gal-pal. "Kourtney surprisingly isn't fazed by this at all," the source says. "She's moving on. She knows it's just a fling."
"She's trying hard to ignore it and just focus on the kids," the source adds. "She knows they'll never get back together."
The mother-of-three's super sexy photoshoot is for photographer Brian Bowen Smith's Metallic Life photo series. Since her July split from Scott, Kourtney appears to be more confident than ever, especially when it comes to being in amazing shape.
Still, she thanked fans for all their support on Sunday.
"Reading your tweets and I need you guys to know how truly touched I am by your love," she wrote. "I love you guys. You help me more than you know."