Name the Stars of <em>The Facts of Life</em>

We're looking for the names of the actresses on The Facts of Life. We could get cute and ask you for all the girls from season one or include Andy Moffet and Beverly Ann Stickle, but let's stick to the core four plus their original housemother. Who played Blair Warner, Dorothy "Tootie" Ramsey, Natalie Green, Joanne "Jo" Polniaczek, and Mrs. Garrett?