Jordana Brewster on 'Secret' Chainsaw Love Story

It's not every slasher movie that leads to gush-worthy love story, but it did for Jordana Brewster.

"I thought making Texas Chainsaw Massacre together was romantic," the actress, 27, tells InStyle Weddings for its spring issue.

Of her fiancé, Andrew Form, 38, who was one of Massacre's producers, she says, "We started dating in secret – you know, hanging out in my trailer – because it would have been unprofessional otherwise. But every day, Andrew wore these work boots to the set, and if I was lying down in the shot or there was equipment in the way, I'd look for his shoes. It was comfortable just to know he was nearby."

The two remained inseparable after filming wrapped in the fall of 2005 – going together to a Bahamas resort for Christmas and then her moving into his Hollywood Hills home after that.

"I was always the girl who said I'd never move in with someone before I got married, and then I just did it," says Brewster. "I'm the biggest hypocrite ever! I had been dating him for only a little over a month, but I never went back to living in my apartment."

Brewster, who will play the lead in the TV pilot of Mr. & Mrs. Smith, based in part on the 2005 Brad Pitt-Angelina Jolie movie, loves her 3.2 carat emerald-cut diamond platinum engagement ring with its matching emerald-cut sidestones – which Form gave to after he noted that she admired the ring while they were shopping in New York.

Form proposed on their one-year-anniversary of being together – but it wasn't a smooth proposal. Brewster had a hunch he was going to ask her while on vacation at the San Ysidro Ranch in Santa Barbara, Calif., where John and Jackie Kennedy had spent their honeymoon. But when a full day went by and still no proposal, Brewster recalls: "I started thinking, Oh my God, he's not going to do it! Then we got into an argument at Nordstrom because I wanted him to buy a jacket and he kept insisting it wasn't his style."

Photo by: Courtesy Instyle Weddings
Things got so bad that Brewster text-messaged her best friend. " told her we were fighting and [the proposal] was not going to happen. She wrote back, 'Don't worry – everyone gets into a fight on the day they get engaged.' "

Sure enough, once back in the hotel room, despite her funk, Form sprung into action, lighting candles and whipping out a little box containing the ring.

"I wanted to surprise her," Form tells the magazine. "I wanted her to let down her guard, which she finally did."

The two aim to wed either later this year or in early 2008, whenever their schedules permit.