The pop star shared the news on her Instagram account Monday. She posted a photo of a ring on her finger and wrote: "He gave me his heart on Valentine's Day, and I said YES!"
Lady Gaga and Kinney met on the set of her "You & I" video in 2011. Kinney stars in the NBC series "Chicago Fire" and had a role in the film "Zero Dark Thirty."
Lady Gaga's hits include "Poker Face," ''Bad Romance" and "Applause." She recently won her sixth Grammy Award, for her "Cheek to Cheek" album with Tony Bennett. She's scheduled to perform at Sunday's Academy Awards.
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