Exactly! He needs to be ginger before he's a woman...unless he is a ginger woman...oh what if he regenerated into a Donna Noble look a like? I'd watch Catherine Tate be the real Doctor/Doctor Donna. That would be awesome!
Peter Davison (Five), Jon Pertwee (Three), Patrick Troughton (Two) and Richard Hurndall (One, in place of William Hartnell, who died in 1975) carry a Tom Baker (Four) wax figure during a photoshoot for "The Five Doctors"