Miley Cyrus, John Mayer and other odd celebrity couples (William West / AFP)

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When Billie Piper was a teenager, and known for her catchy pop tunes, she hooked up with Radio DJ and TV presenter Chris Evans. It seemed strange at the time (many wondered why the hot young singer would date Evans, 16 years her senior and famously a bit goofy) but they married after six months and separated three years later. They remain good friends.

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