No two hearts yet, but eventually. Right now though, John Smith - The Doctor - felt like he could use another one since the one he had was in his throat.
"Oh yes," he said, all courage and excitement and none of the near dread he was sort of feeling. "Born ready." But it was exciting, too. Being with himself and Rose both. Tara should have been here too, he realized. But she'd been so busy lately, and... well. Bit late now, right?