The Celestial Unicorn is a Webkinz pet that you purchase at the Ganz eStore. 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.
Celestial Unicorn Gift Box
Celestial Swing, the Celestial Unicorn's Pet Specific Item.
Soaring Star Sorbet, the Celestial Unicorn's Pet Specific Food.