Decade after decade, Monroe keeps showing up in popular culture in different guises. In the 1960s she was Andy Warhol's silk-screened muse; in the '80s she inspired Madonna's career-defining "Material Girl" video. Just flip through a celebrity magazine: some of-the-moment young starlet or pop singer will be channeling (or outright appropriating) those platinum locks and the bright red lips, oozing confidence and glamour. Though what is the secret of Marilyn's enduring appeal? It depends on whom you ask — and that's fitting, really, because Marilyn, more than other iconic celebrities, was different things to different people.