Rob Kardashian and Blac Chyna have taken their relationship to a whole new level. Surprise! News that the 29-year-old Keeping Up With the Kardashians star had proposed, 7-carat-style, to his girlfriend of just a few months certainly raised a few eyebrows this morning. But while this coupling seemed at first glance like a fling, stranger couplings have stuck. Cameron Diaz & Benji Madden: These two tied the knot not just after seven months of dating and just celebrated their one year anniversary in January. Once upon a time, Beyonce and Jay-Z seemed unlikely. The Destiny's Child princess coupled up with the rap mogul with the rough past. Fast forward fourteen years, the couple just celebrated their eighth wedding anniversary.