The Doctor had on that proud grin she always got when she was showing off her TARDIS to new people. (At least Lucy didn't go through 'it's bigger on the inside'.)

"Isn't she?" she agreed, fondly running a hand over one of the supports. The old girl never ceased to amaze. "TARDISes were grown and cultivated by my people. They're capable of traveling through the Time Vortex. She's sentient, and a bit pyschic. She'll translate other languages for you, makes it easier for me. Learning every language in the universe would be a bit boring."