Kelly Osbourne doesn't speak to her older sister.
The 36-year-old star doesn't "understand" Aimee Osbourne - who she previously lived next door to in 2014 before they both sold their respective homes in March the following year - and so they simply don't have any contact with one another.
Speaking to Dax Shepard on his 'Armchair Expert' podcast, Kelly admitted: "We don't talk. We're just really different. She doesn't understand me and I don't understand her."
Aimee, 37, has previously admitted she doesn't "socialise" with Kelly or their brother Jack, 35.
She said in 2015: "I wouldn't say there is an ease between us, but there is an acceptance. Do we socialise? No.
Aimee was the only member of her family not to participate in their reality TV show 'The Osbournes' and she's previously explained being on the show was something that "didn't really line up with what I saw my future as."
She added in an interview last year: "It definitely worked great for the rest of my family, but for me, and who I am, I just knew it was never something that I would have been able to consider realistically."
Meanwhile, after recently revealing she'd relapsed after almost four years of sobriety, Kelly told how she began to struggle when in-person AA meetings went online due to the coronavirus pandemic.
Speaking to Dax - who himself recently confessed to his own relapse - she said: "I started to do the online meetings. I didn’t like them. The best part about going to an AA meeting is that you don’t have to look at your f****** self."
The former 'Fashion Police' star explained she grew increasingly "angry and resentful" about the fact she was getting "nothing out of" the meetings, particularly as they used to "mean everything" to her and helped her to "figure out" who she really is.
And Kelly admitted she wasn't alone in relapsing.
She said: "Slowly but surely, I stopped calling my sponsor. Slowly but surely, I stopped connecting with my girls. Slowly but surely, one girl relapsed. Then another girl relapsed and then all my friends relapsed."