With Cupid's big day coming up and the celebration of relationships bound by everlasting love (or at least love right now), it's important we all remember one thing: it doesn't matter how hot, rich, charismatic or talented you are, no one on the planet earth is immune to breakups. In the spirit of the holiday, here's a collection of 18 celebrity power couples, including pro athletes, rock stars, and supermodels, who all once felt the sting of splitsville when their love ran dry in this special Valentine's Day #ThrowbackThursday.