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These two have been up and down (or "hot and cold," if you will) for years now, and E! News has exclusively learned from a source close to the couple that they've called it quits again.
The insider didn't offer any specifics as to the reasoning behind the two celebs' decision to break up, but notes that they're known to make-up time and time again (we know), so it's very possible these two will reunite in the near future.
However, until that happens, we would like to offer this masterpiece—Katy Perry and John Mayer's relationship as told through the lyrics of her popular hit "Hot and Cold," which, as you might guess, perfectly describes their romance over the years.