Those worried that Marvel's upcoming live-action Thor movie wasn't exactly bringing the star power like some other related superhero films should look no further than today's announcement that, as previously rumored, Natalie Portman has been cast as Jane Foster in the film, due in theaters on May 20, 2011. In the comics, Foster was a nurse who later became Thor's first love, but her character will be updated for the movie. Chris Hemsworth is set to play the title character, while Tom Hiddleston will take on the role of the villainous Loki. Kenneth Branagh will direct with production slated to begin early next year.

Here's the synopsis that came with today's press release: Marvel Studios expands its film universe with a new type of super hero: "Thor." This epic adventure spans the Marvel Universe; from present day Earth to the realm of Asgard. At the center of the story is The Mighty Thor, a powerful but arrogant warrior whose reckless actions reignite an ancient war. Thor is cast down to Earth and forced to live among humans as punishment. Once here, Thor learns what it takes to be a true hero when the most dangerous villain of his world sends the darkest forces of Asgard to invade Earth.

What do you think of Natalie Portman in the role of Jane Foster?