Damn I wish Billie was in this.

I vote for Billie to play Catherine Howard. (ETA: err, fandom being as it is I should clarify this is not born from a desire to see Billie have her head chopped off, it's because Catherine's the one who did loads of pre- and extra-marital shagging, and it entertains me to imagine Billie starring in Belle Du Jour: The Tudor Years.