Harry Styles has accomplished a great deal since he rose to stardom as part of One Direction - and he's had some very famous faces by his side along the way. One year after competing on The X Factor U.K., Styles had a brief relationship with Caroline Flack in 2011. He then started seeing Taylor Swift, but their romance was also short-lived. "I think relationships are hard enough, so I think you have to completely ignore everything from outside," Styles exclusively told Us Weekly after his 2013 split from Swift.