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Lately there's been a spate of blink-and-you-miss-'em marriages in Hollywood, reminding us that a wedding doesn't necessarily mean a lasting relationship. Of course, longtime daters sometimes do decide to get hitched: Earlier this week singer Julio Iglesias (and Enrique Iglesias' dad!) married his girlfriend of 20 years, Miranda Rijnsburger.

But there are plenty of famous couples -- like Brad and Angelina -- who don't seem to care about marriage, and are staying together sans wedding bands. After the jump, some of the most famous happily unwed couples.