Why not? *suggestive eyebrows* And, seriously, as 11 was my first Doctor, and I absolutely adored 9, I thought I'll never get used to Tennant's Doctor - and how glad I am for being wrong! Now I wonder if he's not my favourite.
Hahahaha, same thing here! I started with 11, then moved to 9 and 10. Before watching any of Tennant's episodes, I thought that 11 would always be my favourite. Now I go back and forth beween 10 and 11.