Matt Smith (in-universe)

Matt Smith was an actor in the Doctor Who series.

When the Eleventh Doctor materialised his TARDIS in the studio where Red Nose Day 2011 was being filmed, the screen behind him showed an image of Matt Smith next to a TARDIS and the words "Doctor Who". (TV: The Doctor Drops In)

In Red Nose Day 2013, Claudia Winkleman rhetorically asked how amazing Matt Smith was in Doctor Who. (TV: The Doctor Appears)