After enjoying a trip to Miami with the 18-year-old, Scott, 32, returned home to LA – and it looks like Lindsay went with him.
The self-styled Lord shared a snap of the view from his house, before posting one of him and Lindsay posing in fur coats and not a lot else.
But, while some sources insist Scott and Lindsay are ‘just good friends’, others aren’t quite as convinced.
Kourtney, 36, is said to be focusing on the kids, but Scott’s latest fling is allegedly the final nail in the coffin.
An insider told Entertainment Tonight: “Kourtney surprisingly isn’t fazed by this at all. She’s moving on. She knows it’s just a fling.
“She’s trying hard to ignore it and just focus on the kids. She knows they’ll never get back together.”
According to reports, Scott and Lindsay met in New York, and were spotted on a night out together there last week.
After partying together all night, they returned to Scott’s hotel room around 6am.
A source said: “He had his arm around her and they looked very couple-y. He kissed her a few times and was whispering in her ear with a smile on his face.
“She seems very in to him but a little out of place, very uncomfortable when people were looking at her.”