The Celestial Unicorn is a eStore-only pet. It is not retired, and does not have a Lil' Kinz version. It can fly, and comes with a Treetop room. It is only available to Deluxe members.
Gallery
Celestial Unicorn Gift Box
Celestial Swing, the Celestial Unicorn's Pet Specific Item.
Soaring Star Sorbet, the Celestial Unicorn's Pet Specific Food.