Scarlett Johansson and Ryan Reynolds are notorious under-sharers, having spent their brief and low-key marriage shunning cameras and reporters' questions. So, it comes as no surprise that their shocking split this week was kept under wraps for even the people that know them.

"No one had any idea this was coming," a friend of Scarlett's tells me. "They kept their private life so secret that I doubt we will ever really know what went wrong."