Ah, the Taylor Swift days. While many believe this relationship was solely for the purpose of publicity, the fact remains that the two were linked for a period of a few months in late 2012 into early 2013. After "breaking up," Taylor went on to write several songs supposedly about Harry ("Style" and "Out of the Woods" just to name a couple), which is something no one ever would have expected (kidding). In turn, Harry has also possibly written a few songs right back for her, like one of One Direction's last singles, "Perfect," and his recent solo song "Ever Since New York."