Not that I want to turn into a gossip blog or anything but, quoi?
I mean, I know they were together in Secret Diary of a Call Girl, and I'm sure if I googled it I would find the true (or, close enough to the true) reason for the hand holding, but it's so much more fun to speculate. This is why I can never actually be a journalist (bachelors degree be damned). I find that I have so much more fun imagining the reasoning for major events than finding out the truth behind them.
But you know wot they say, truth is stranger than fiction. Maybe one day I'll encounter that strangeness and be able to turn my whole viewpoint around. I like to keep my options open.