Kate and Chris split - where's the surprise?

So Kate Hudson and her husband Chris Robinson have split up after nearly 6 years of marriage and everyone is surprised, but I ask, why? I'm sure that he is a nice guy, but she is 27 and he is 39 and to be fair she is a gorgeous girl and well he's pretty average, well to be honest less than average! (Sorry!) Whether Owen Wilson is involved or not I have to admit it is hardly a shock, or really that news worthy!!