Jamie Alexander, who plays Sif, the strongest of female warriors in the new film "Thor: The Dark World", hit the premiere of film, yesterday; in a practically nude gown.

The actress stepped out on the red carpet in a black sheer panelled Azzaro gown which revealed her perfect cleavage, toned, and flat abs, one long, gorgeous right leg and entirety of her left behind.

She coupled her look with a vintage styled chignon subtle make-up, smokey eye and long diamond drop earrings.

In spite of the nudity the actress carried the gown with utmost sophistication and what really impressed us was Jamie's well-toned body. Apparently, the actress has done extreme training to get into the role for the film.

She told Entertainmentwise.com, "I started training two months in advance [of filming] and a lot of weight training to play the character of Sif in Thor franchise. But more so this goes around, I also did a lot of yoga and Pilates because I needed to be very flexible and do a lot of martial arts."

And as they say nothing comes for free of cost, while training for the film, Jamie hurt her back.

"I did injure my back and healed in about three weeks. However, I have a better posture than before. I think there's a blessing in everything." she revealed to Entertainmentwise.com.

"Thor: The Dark World" is all set to release in US on Nov.9 and is the strongest contender at the U.S box office this week. The movie was released in UK last week and made more than 8.65 million dollars on its opening night.

According to data collected by Contactmusic.com, "The film was a number 1 release in several countries, including France, Germany and Spain taking $109.4 million worldwide in its first weekend."

We hope that it also proves to be a success on the U.S box office.