Britney is making a cameo in the new Pussycat Dolls video, "When I Grow Up." In the vid, Brit will be driving a car, waving at the Dolls as they pass…• Poor Janice Dickinson! Her lil' chocolate lab ran away. TMZ is being snarky about it because Janice is a loon, but you can't hate on a woman who lost her puppy. It…