Thanks for the link Mozzie. Looks like neither had a choice about appearing and neither wanted to be there, like naughty children being told to say sorry for something they've done wrong..."no Sean and Katya, say sorry again, properly this time please and like you mean it!!!" Oh and Sean's understatement of the eve "it wasn't the perfect relationship." Well clearly not when you have your tongue down someone else's throat on your girlfriend's birthday FFS! 
Anyhoo... back to the dancing....