A B-lister for your A-list event? You've been carrying on a one-sided romance with celebrities for years, watching them on big screens and small, dancing to their chart-topping singles and tweeting at every twist and turn of their private lives. Isn't it time you brought one home? Outrageous as it sounds, renting a celebrity today might turn out to be well within your budget. Thanks to the explosion of cable programming, viral videos and reality TV shows such as "American Idol," "The Bachelor," "Survivor" and "Jersey Shore," there are more "celebrities" than ever before -- all anxious to schmooze at your fundraiser, croon at your wedding or shout "Mazel tov!" at your bar or bat mitzvah. "There is a celebrity for every budget," says Mike Esterman, a celebrity booking agent based in Washington, D.C., who places stars at public and private events around the world. "Anybody can buy a celebrity hos...