The actress said "I Do" to director Michael Polish in Montana at the beautiful Ranch at Rock Creek in true country "meadow" style, a source tells E! News.
According to Martha Stewart Weddings, who helped planned the couple's big day, Kate stunned in an ivory radzimir-satin strapless Oscar de la Renta strapless ball gown that had a "sweeping eight-foot-long, 16-foot-wide train, as she made her way down the aisle at the wedding, which "took place at sunset" on top of a mountain.
Polish, meanwhile, wore a three-piece charcoal-hued Brooks Brothers suit.
Guests were driven from the gorgeous ranch halfway up a mountain to witness the breathtaking ceremony that had the couple surrounded by wildflowers to perfectly complete the meadow feel.
The couple, who began dating in September 2011, exchanged vows in front of around 60 family members and friends, who included actress Lake Bell and Academy Award–winning actor-producer Walton Goggins.
The actress switched up her attire for the reception, held at the ranch's Granite Lodge, changing into a floral embroidered tulle dress with an "illusion neckline and scalloped cap sleeves," according to the mag.
Guests enjoyed a dinner of "local fares" there and music provided by Kelly Willis and Bruce Robison.
Following a bit of dancing in the historic Silver Dollar Saloon, everyone headed to an after-party.
More details of the couple's wedding will be shared in the Winter issues of Martha Stewart Weddings set to hit newsstands Dec. 30.
Congrats to the happy couple!
(Original story was published on August 31, 2013 at 8:16 p.m.)