Yes indeed, the late great Eartha Kitt. The credits listed that it was indeed her voice, so the show's writers must have had Kitt record her part in this shortly before her death, and been saving it to use for just such an occasion.
The Elder God from Soul Reaver would like to offer his feedback on The Simpsons. Elder: Unwilling to revive Futurama for another season or two, Fox condemned The Simpsons to the decay you see. From that moment, the unraveling began. Now it is nearly played out. Springfield teeters on the brink of colapse. It’s fragile balance cannot hold.