See Chris Klein's Montana Wedding! All the Sweet Details of His 'Perfect Day'

Chris Klein describes his Montana wedding on Saturday as the “perfect day.”

The American Pie actor, 36, and his girlfriend of four years, travel agent Laina Rose Thyfault, 30, tied the knot in front of 115 guests during an outdoor ceremony at the Rainbow Ranch.

Klein tells PEOPLE the two picked the location after a trip to Montana a few years earlier.

“We fell in love with the area and the nature,” says Klein. “Luckily we have families who love to travel and also love nature so it was the perfect spot for us.”

The picturesque locale featured an outdoor church with vintage pews on the banks of the Gallatin River, making the perfect backdrop for the bride, who wore a dress by Yumi Katsura to walk down the aisle.

“Laina looked beautiful. She holds herself with such grace,” Klein tells PEOPLE. “I am a very grateful man.”

The ceremony was followed by a “big old country hoedown,” Klein says, a nod to the couple’s Texas roots. Guests dined on BBQ brisket and fried fish while a DJ spun country music, including the couple’s first dance song, George Strait’s “I Got A Car”.

“The song is actually about a man who meets a woman and they go start a life together,” says Klein. “We did a groovy two-step to it!”

But the most special part of the evening for Klein was exchanging the vows.

“Promising forever was definitely the highlight,” he says. “Nothing gets better than that.”

For more from the couple’s wedding, pick up the latest issue of PEOPLE