The pair has been an item since February 2008 and the stars have a home in Toronto, Canada, where Domi played for the Maple Leafs team.
Opening up about her romance with Domi, Nip/Tuck star Carlson tells Star magazine, "I have a boyfriend I've been with for a while. Tie Domi. We live in Toronto when I'm not working."
Carlson is part of an elite group of celebrities to have found love with ice hockey players; Hilary Duff is dating Edmonton Oilers player Mike Comrie and Carrie Underwood is romancing Ottawa Senator Mike Fisher.