Movie star Jaimie Alexander (Lady Sif) looks amazing as she arrives at the world premier of “Thor” in Sydney, Australia.Thor hammers into theaters May 6th 2011, directed by Belfast-man Kenneth Branagh starring Chris Hemsworth as Thor, Tom Hiddleston as Loki, Anthony Hopkins as Odin, Jaimie Alexander as Lady Sif and Natalie Portman as Jane Foster.