Howling:10th Doctor Technicality? (Spoilers)

The doctor has 12 regeneration cycles, correct? The 10th doctor TECHNICALLY used one of the series 4 finale episodes. Does that mean David Tennant is TECHNICALLY both the 10th doctor AND the 11th doctor?

Just because he didn't change his face, doesn't mean he didn't use a regeneration. The doctor number increases every regeneration so are we not at 11 doctors now?

--Solo