Unless you're an only child, you'll have first hand experience with sibling rivalry, and being a celebrity doesn't make you immune to it.
Kim Kardashian has unveiled an Instagram account and a website for her own beauty line, KKW Beauty.
She's also uploaded a video that has given us the date of the launch, June 21st.
It's not yet clear what the line will include, but many think that it will either be skincare or makeup (with a cheeky collaboration with her sister, Kylie.)
If this was to happen, it's not the first time that the pair will have collaborated in the beauty department. In April of this year, both Kim and Kylie collaborated for a nude lippy collection.