"I'm madly in love," the 31-year-old actress and model tells InStyle Makeover's fall issue. "He just brought light to my life. I feel lucky every morning when I wake up and see him."
Hopefully the mystery man likes children, because Larter sees them in her future – after her career calms down a bit.
"I'm loving this right now," she says of acting. "But I can't wait for that."
Larter, who plays Niki Sanders on NBC's Heroes, spent many years modeling before she caught the acting bug. But growing up, she was hardly the most beautiful girl on the block – more tomboy than TV star.
"I had a bowl haircut," she says. "My face was always flushed, and I had one big tooth. I was the sweaty dirty girl, and I'd come home with one sock up, one sock down."
"Last night I was in my skintight Brian Reyes dress and Louis Vuitton heels. ...Today I packed my weekend bag – cargos, sneakers and sweats," she says. "And you know what? I need both. Balance is something that we all strive for, but for me it's to make sure my life has enough downtime, plus a bit of play."