Miley Cyrus, John Mayer and other odd celebrity couples (Theo Wargo / WireImage)

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Woody Allen famously caused a bit of a stir when he started dating Soon-Yi Previn (34 years his junior), the adopted daughter of ex-wife Mia Farrow. Although Woody was never a father-figure to Soon-Yi, it was still a controversy, especially because he'd split with Farrow shortly before. Despite the strange foundations of this relationship, the couple have been married since 1997, and have two adopted daughters together.

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