The Superman Returns star and fianc e Courtney Ford plan to wed next fall

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Brandon Routh is engaged to his girlfriend, actress Courtney Ford, his publicist tells PEOPLE exclusively.

“They are very happy,” says Kacey Spies, who represents the Superman Returns star.

The couple, who have been dating for three years, will costar in the upcoming short film Denial. They plan to wed next fall.

Routh, 26, proposed earlier this month with a ring from Los Angeles-based jeweler Neil Lane.

The couple met “not through acting. I used to work at Lucky Strike,” Routh told PEOPLE at the Golden Globes in January, referring to the hip bowling alley in Hollywood. “I was a bartender. And her brother was having his (wedding) rehearsal dinner party there.”

Added Ford, 28, “He met my whole family the day he met me.”

The pair, who told PEOPLE they like to watch DVDs – particularly the special features – together, were apart for five months while Routh was shooting Superman Returns in Australia, but Ford says they relied on “nightly phone calls.”

Speaking with PEOPLE in June, Routh called Ford his personal kryptonite. “She brings me to my knees,” he said.