Who's the fat girl?

Hellyeah dude! ;)

Lydia Rose Bewley and yes she is very beautiful

You can also see here in this parody of the 80s kids show Knightmare

http://www.youtube.com/watch?v=ERLLUoZn0mM

She first appears at 1:37

---We will rule over all this land and we will call it... This Land.---

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She would look good if lost all that weight.