In 2004, Nicole Richie gave her "Simple Life" co-star Paris Hilton a curious gift for Christmas -- a pet rat. Its name? "Tori Spelling."

[Richie told the former "Beverly Hills 90210" star that she had named the rat after her as a tribute. "Tori said that it was funny, but I could tell it hurt her feelings," Richie told the New York Post. "Tori felt that I think her face looks like a rat's, but I actually own six rats and I named each after a character on 'Beverly Hills 90210,' like Shannen Doherty and Luke Perry."]