From Christina Applegate and Brad Pitt to Justin Timberlake and Fergie, see Hollywood's odd couples of the past
Scarlett Johansson & Josh Hartnett
Distance and differing commitments did this couple -- who dated for more than a year -- in 2007. "At the end of the day we're just ordinary people, and it didn't work," he has said, adding that the breakup was "really painful."
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