The fourth and final set of Princess Ponies was printed in Year 9, between 1990 and 1991. It included only two ponies. Unlike previous princess sets (the Year 5 Princess Ponies, Year 6 Princess Ponies, and Princess Brush n' Grow Ponies), these ponies do not have jewels or medallions anywhere on their bodies, and instead of metallic tinsel they have strands of iridescent, translucent plastic in their hair, like the Pony Bride of Year 8. Both ponies were printed in the Bride Pose. Their most unusual attribute is their long, thick, black eyelashes. Each princess came with a silver-colored tiara, an iridescent polyester cape with a faux-fur collar, and a frog brush.
Princess Royal Pink is a pink adult earth pony with blue eyes. She has long, dark blue hair with iridescent plastic tinsel. Her symbol is a dark pink and blue castle. She is in the Bride Pose. Princess Royal Pink came with a silver-colored tiara, an iridescent polyester cape with a bright pink faux-fur collar, and a dark pink frog brush.
Princess Royal Purple is a purple adult earth pony with blue eyes. She has long, dark pink hair with iridescent plastic tinsel. Her symbol is a a dark pink and blue royal carriage. She is in the Bride Pose. Princess Royal Purple Princess came with a silver-colored tiara, an iridescent polyester cape with a pale aqua faux-fur collar, and a blue frog brush.