Jaimie Alexander in Revealing Dress at Thor Premiere: Discover the Secret to Her Body!

Jaimie Alexander on November 4, 2013 in Hollywood, California
Jaimie Alexander arrives at the Los Angeles premiere of "Thor: The Dark World" at the El Capitan Theatre on November 4, 2013 in Hollywood, California Gregg DeGuire/WireImage.com

Jaimie Alexander stole Thor's thunder at the star-studded Hollywood premiere of her new film on Monday, Nov. 4.

The actress, 29, ditched the undergarments on the red carpet of the Thor: The Dark World event wearing a revealing, black Azzaro Couture gown. The dress included a see-through panel, that ran vertically from her collarbone to the floor, exposing not only the up-and-coming star's backside, but her fantastic physique. It turns out that Alexander (also girlfriend to actor Peter Facinelli) had prepped for her golden moment by getting a spray tan, Us Weekly has exclusively learned.

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The star got a St. Tropez spray tan ahead of her sexy red carpet appearance — the purpose of it, to contour her body so that she would look extra good in her dress before the cameras. Fiona Locke, a St. Tropez skin finishing expert, gave Us more details on how the star got ready for her big night.

"Jaimie has an absolutely extraordinary figure, but with such a revealing dress, we did a custom St. Tropez Skin Finish to contour the body — enhancing her natural shape and muscle tone,” explained Locke. And no wonder the actress worked with the red carpet with such ferocity: "Skin Finishing adds a layer of confidence to your skin, making you feel a little less naked."

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For those who want to mimic Alexander's look, the tanning can actually be done at home using St. Tropez Self Tan Bronzing Mousse. "After applying an even layer to the body, go back to the natural shadows created by muscle tone and add an additional layer of product, along the shadows to really carve out the detail of the muscle,” explains the tanning expert.

Locke adds, “Jaimie also had some natural tan lines that she wanted to conceal." To even out the film star's skin tone, Locke says she went back to these lighter areas and "added a second sweep of product to conceal any unwanted lines, creating gorgeous, even skin from head to toe.”

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And voila: Bronzed perfection!

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