Katie Holmes and Jamie Foxx dated for over a year. There were also some rumors about an engagement, but it never happened. The two started seeing each other back in 2013, and kept it so lowkey that most people had no idea they were dating. And just as they stepped out at the Met Gala together in a very rare appearance together, they later on announced they broke up.
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There have been countless of rumors about their breakup, but neither of them talked about it.