The Huffington Post has put together a list of the Most Controversial Couples of the Year. Here are several of them. . . Mary Kate Olsen and her 42-year-old boyfriend Olivier Sarkozy. Hugh Hefner and Crystal Harris. Liam Hemsworth and Miley Cyrus. Rihanna and Chris Brown. Selena Gomez and Justin Bieber. Mila Kunis and Ashton Kutcher. Robert Pattinson, Kristen Stewart and Rupert Sanders.