Everypony remembers the ‘Best Young Flyer’ competition.  The white unicorn with the butterfly wings and the sonic rainboom.

What is not so well known is that Rarity also had the most beautiful thoroughbred white alicorn wings for a fleeting moment in time.  Nopony would have ever believed her, and she probably would not have believed it herself were it not for a very special photograph hanging on the wall of her boudoir.