Actor Alexander Armstrong has released, through Twitter, a picture of himself with current Doctor Who Matt Smith on the set of the 2011 Christmas Special - see it above. You can follow Armstrong on Twitter HERE.Actor Alexander Armstrong has released, through Twitter, a picture of himself with current Doctor Who Matt Smith on the set of the 2011 Christmas Special - see it above. You can follow Armstrong on Twitter HERE.Labels: 2011 christmas special, 2011 xmas special, Alexander Armstrong, christmas filming, doctor who 2011 christmas special, dr who filming pictures, dr who xmas 2011