These only shows in Roblox>Versions>(Lastest versions)>content>textures>UI
This is also where you would expect them to show up.
And part of me thinks @wevetments is right, there seems to be a lot of different shapes that resemble different parts of the icon so it could just be a few shapes combined together to form the icon. You’re well better off to trace it using illustrator instead of actually combining them since that saves up a lot of time. Plus, tracing it shouldn’t be too difficult given the simplicity of the icon.
Are you sure that’s the current icon? The only other star creator related icon I could find in the client files is:
rbxasset://textures/ui/PlayerList/StarIcon@3x.png Like what @wevetments said, it might be a custom icon as I can’t find it anywhere.
Edit: Ok I see what you mean but, it seems like the new icon hasn’t been shipped yet. I couldn’t find it even with the use of the mod manager to get unreleased builds. It’s also subject to change so you should probably stick with the current version until it gets released.