Murphy and Joe Macaluso in Oct. 2005
Chris Polk/Filmmagic
The pair, who met when he was working as a production assistant on her 2004 romantic comedy Little Black Book, got engaged over the Christmas holidays, her rep said. The ring is a 3-4 carat Tiffany diamond.
No word yet on a wedding date.
Murphy gushed about her new fiancé to PEOPLE last year, saying: "I'm so happy right now. I feel so lucky."




