The 28-year-old Pretty Little Liars star is engaged to her boyfriend Patrick J. Adams, according to People.
The couple, who has been dating for three years, met on the set of a play in 2009.
Troian recently dished on how they've made their relationship work, considering her 32-year-old hubby-to-be stars on Suits, which shoots in Toronto, while her CW show is based in Los Angeles.
"It's constant coordinating," the starlet told the mag. "It's really hard to be away from the person you love, especially when they're your rock and support system."
"It's a challenge but it's kind of perfect because we're such analytic, hyper intelligent people that sometimes just to be in each other's faces all the time might have been too much for us. We're really growing!"
So far, Troian and Patrick have stayed mum about their engagement on their respective social networking sites.