The actress and dancer, who lost her husband of 34 years, Patrick Swayze, to pancreatic cancer in September 2009, is engaged to jeweler Albert DePrisco, 58, her rep confirms exclusively to PEOPLE.
"Albert proposed to Lisa on Christmas Eve," the rep says.
The couple met through mutual friends at a birthday party for Niemi and have been dating for a year and a half.
A year after Swayze died, Niemi, 57, told PEOPLE she was open to the possibility of being married again.
"I would love companionship love. Absolutely. I hope I’m not one of these women who never want to have another relationship," she said. "But who knows, that’s another bridge I’ll cross when I come to it. I may get there and go, I don’t know. But I like to think that I can.”