The Gaffer???

There's a lot of those type of scence's in the movies..Like when Aragorn, Gandalf, Legolas, and Eomer go to the black gates of Gondor to summon them out to battle...they show Gandalf on his horse with I think it's Pipins stunt double(It an azn women) I remember because I saw her in Sam's Commradory film. She played the uhh "physically challenged" women trying to help Barry Osbourne with the big poster, does anyone know what I am talking about, or am I just blabbering on, like I usually do?