And it's not just a rumour.
Both have appeared in each other's social media posts, and they've made no attempt to keep their PDA secret...
Uh-huh, that's a congratulations cake.
What are they celebrating? Who the hell knows... but big sister Nicole Richie isn't all too keen on her sister's life choices RN.
An insider has revealed that, "Sofia's family isn't exactly thrilled that she's dating Scott, especially because of his reputation for being a hard-partying womaniser.
"He's not exactly dream boyfriend material. Nicole is particularly worried because she knows what Scott is really like."
However, she's not getting in the middle of it.
"Sofia is an adult, so there's nothing anyone can do. Plus, she's so smitten with Scott, that if anyone tells her not to date him, then she's likely to just cut them out of her life. All anyone can do is wait on the sidelines and be there for Sofia to pick up the pieces when it's all over."