Since we're writing about Chihuahuas today, here's the latest in celebrity Chihuahua news. Paris Hilton and one of her teacup pups are starring in the spring/summer ad campaign for Guess.Famouschihuahua.com identifies the dog as Tinkerbell. We guess the newest member of the Paris Hilton canine club -- the teacup Pomeranian she got for her birthday last month from beau Doug Reinhardt of The Hills -- wasn't camera ready.The way we see it, the world needs less Paris and more pets in ad campaigns. Anyway, one of the cutest Chihuahua pictures around can be seen here. Take that, Paris.