SPOILERS

Am I the only one seeing the resemblance here? I know everyone wants to think that Rose is the mother of the Doctor's daughter, but to me the resemblance of Lucy Saxon and Jenny is far, far closer. And it would make for much better drama. Might even save what is looking like it could be a very badly off track episode. The Master sticking it to the Doctor one last time from beyond the grave?
Of course, if she is the Doctor's daughter with Rose it would explain why Rose keeps trying to get through to him, despite the risks to the two universes. In the end, could Jenny be Little Red Riding Hood? Or could it be Lucy Saxon? It'd be one heck of a surprise if it was Lucy.