The news comes after Scott's ex-wife Kourtney has been doing her best to stop the pair taking the next step.
According to RadarOnline.com, as rumours swirl of a possible upcoming engagement between Scott and Sofia, Kourtney, 40, has been meddling - althought she says it's for her ex's own good.
“She swears this is for Scott’s best interests and not because she’s still in love with him, but nobody’s buying it,” a source told the publication.
Kourtney has never been a fan of her ex's relationship with Sofia, who at 21 is 15 years younger than 36-year-old Scott.
“From day one Kourt’s been panicking about this relationship, saying it’ll end in tears and Sofia’s too spaced out and young to be marriage material — let alone a stepmom to her kids!” added the insider.
However Scott isn't having any of it, and has asked her to butt out of his relationship with Sofia.
The source claimed: “[Kourtney]’s taken Scott aside and begged him to think twice before putting a ring on this girl’s finger but he’s told her to back off and stop being bitter.”