When building graphics for an app, I have right-aligned a rating from 1 to three stars. Being mainly a designer, my gut told me to fill the stars from right to left. So, i.e.
filled for a 1-out-of-3, and
filled for 2 out of 3.
The rating is given by the app, and in no way will users have to click on the stars to rate things themselves.
What is the best practice from a UX standpoint: filling right to left or left to right?