Getty ImagesFact: John Mayer is a heartbreaker. We'd even go as far as to say he's the second-biggest heartbreaker in Hollywood, falling right behind that silver fox George Clooney. This is very apparent from Mr. Mayer's extremely long list of hot, talented, very sweet celebrity exes. However, it's harder to pinpoint what it is, exactly, that gives him the power to break the hearts of stars like Taylor Swift, Jennifer Aniston, and, most recently, Katy Perry. (Seriously, Katy seems devastated...
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