Natalie Portman isn't afraid to get down and dirty for work.
Filming for Thor: The Dark World in London Wednesday, the Oscar winner had what appeared to be soot smudged on her face. The dressed-down star wore jeans, a crumpled flannel shirt and a dirty jacket as she reprised her role as Jane Foster for theThor sequel.
Doesn't looks so happy does she? It's her fault for signing on in the first place :P