It seems just about everyone in Hollywood wants to save the world these days.

Celebrities are looking for charities to represent, and charities are looking for celebrities to represent them. But is it really worth it to have a star supporting your cause when you're forced to deal with the diva demands, paparazzi penetration and personal problems that often accompany a famous face?

For example, Mothers Against Drunk Driving had every reason to be hopping MADD late last year when their spokesgirl, Miss Teen USA Katie Blair, was caught carousing with her sash sister, former Miss USA Tara Conner, and drinking while underage in New York nightclubs.

Paris Hilton, meanwhile, reportedly promised to give $250,000 to an Australian charity, Paradise Kids, and to organize a fundraising concert in support of seriously ill youngsters.

But that was over two years ago, and the Hilton heiress hasn’t been back in contact with the organization.