Behind the Scenes Look at Kate Bosworth's Wedding Gown

Kate Bosworth tied the knot Saturday in an intimate, understated ceremony in Montana, but her wedding dress was anything but.

The "Superman Returns" star, 30, walked down the aisle to fiancé Michael Polish in a custom-made wedding gown by the legendary designer Oscar de la Renta.

Photos: Hollywood in Love

"I love the dress because when you see the front it feels so minimal, then when you turn around there's this dramatic fall of the fabric," Bosworth told Vogue Digital Channel of the full-skirted, satin, strapless dress with an 8-ft-long, 16-ft-wide train.

The actress brought Vogue along with her when she traveled to New York City for her final wedding dress fitting in the Oscar de la Renta showroom, giving an unprecedented glimpse into the makings of her fairy tale wedding look.

"I was totally shocked at my complete lack of control of my emotions in that moment," Bosworth said of her reaction to seeing herself for the first time in the gown, which she paired with a cathedral-length veil and estate jewels to complete the look.

"It's a dress that reflects the love I have for my partner," she said. "It's a reflection of my life. It's a reflection on the woman I've become."

Bosworth and Polish, 42, who met on the set of "Big Sur" in 2011, said "I do" during an outdoor ceremony at The Ranch at Rock Creek in Philipsburg, Mont.

The bride arrived at the wedding ceremony in a stagecoach pulled by two horses, according to Vogue, and walked down the aisle before around 50 guests that included actress Lake Bell.

For the reception and dance party, held at the Silver Dollar Saloon, Bosworth changed into another de la Renta creation, a "floral embroidered tulle dress with an illusion neckline and scalloped cap sleeves," according to Vogue.

The wedding was coordinated by Martha Stewart Weddings and will be featured in the magazine's winter issue.

"We had a blast working with the super-stylish, creative and down-to-earth couple," Elizabeth Graves, the magazine's editor-in-chief, said in a sneak peek of the wedding posted online. "Their love for each other…well, it's infectious…They envisioned a celebration that mixed Victorian touches and romantic Western influences, bookended by fun events that took full advantage of the Montana setting."