Right, Ceres is in the asteroid belt. I looked it up and still managed to botch it. 
My very elderly mother crazily just surveyed Uncle Ned’s palatial household, missing everything.
"My very Evil mother just served us NOTHING!!! Nothing at ALL! And we haven’t eaten in four days! And then she ate a huge meal right in front of us, too!"
The first sentence is for the known planets, the rest of the mnemonic is for planets we may or may not discover in the future. But I felt it was important to tell the entire story of how that evil woman tried to deliberately starve us to death.