The Blue Crush actress, 30, wore a traditional strapless dress with a full train, and kept her hair tied up and pulled back from her face, according to US Weekly. Kate arrived at the idyllic venue in Montana by stage coach, pulled by two horses.
The radiant bride and her handsome beau exchanged vows in front of about 50-75 guests in Saturday's romantic ceremony. The pair wed on top of a mountain at The Ranch at Rock Creek, overlooking the lush hay meadows and rolling foothills typical of the region.
Guests were given Polaroid cameras and asked to take photographs of the happy couple, and complete the captions with the phrase, "Love is... ".
Kate and Michael, who met on the set of Big Sur in 2011, got engaged when the film director proposed during a trip to South Korea.
The couple's love was real from the start, with Kate saying in an interview, "I never even dated my husband-to-be. He said to me after just a few weeks, before we were even together, 'I'm going to marry you.' He just knew."
Kate has previously dated Orlando Bloom and Alexander Skarsgard.