Even if some members of the KarJenner clan approve of Scott Disick‘s relationship with 19-year-old Sofia Richie, it’s safe to say that his baby momma Kourtney Kardashian will never be one of them. Granted, Kourtney has moved on with uber-hottie Younes Bendijma, but that doesn’t mean she appreciates Scott and Sofia playing house — literally — in a $5.96 million mansion, no less!

Sources from Celebrity Insider have reported that Lionel Richie‘s youngest daughter has officially become Lord Disick’s very own interior designer. An insider explained, “Sofia is already helping Scott pick out the colorway, furniture, and making other interior design choices for his newest home, and it’s driving Kourtney crazy. Scott is making Sofia feel very welcome at his new place, and he wants her to feel like this will be her home, too, so he is giving her free reign on many of the design choices, which Sofia is loving.”

Beyond being angry, it seems Kourtney is also feeling a little left out. Having studied interior design for many years, decorating is something she and Scott often did together. The insider continued, “It makes Kourtney sad, too, that someone else is taking control of something that has always been Kourtney’s role in Scott’s life.”

Whether or not Sofia will be the one to end the Kourtney/Scott love saga once and for all, remains to be seen, but it’s clear the two are getting pretty serious. Even if they’ve only been dating for about a year — despite many split rumors — Sofia has become a staple in Scott’s life, particuarly when his three shared children with Kourt are invovled. It looks like these lovebirds are keeping things alive no matter what the eldest Kardashian sister has to say about it.