The way relationships go in Hollywood, it's no wonder we didn't hear about some of these. We probably blinked!
But did you know that Tom Cruise and Cher had a "thing" in the 80s?!? And before Justin Timberlake and Britney Spears were an item, Justin's lady friend was Fergie. Some might think Fergie was robbing the cradle a bit... she was 23 and Justin was just 16!
CLICK HERE to get the whole list of "unbelievable but true" celebrity hookups!