Who is on the cover of Cats of the Clans?

The cats on the front cover are the four leaders of the four Clans (ThunderClan, WindClan, RiverClan and ShadowClan). On the top is Firestar, the leader of ThunderClan. To the right of him is Leapardstar, the leader of RiverClan. On the bottom is Tallstar, the leader of WindClan. And to the left of Firestar is Blackstar, the leader of ShadowClan.