You can spawn creatures of 3 or more stars with just the console. They appear as base-level versions of the creature and have no stars on their health bar, but still have the stats and drop rates appropriate to the star-level they were spawned at.

The only thing that makes this fact not particularly likely in your case is that it would have to be on either a local single-player map or be done by a character that has been given administrative rights in the game's config file.