Russell and Shane Deary, a contractor, are expecting their first child during the summer, People magazine said Friday.
Russell and Deary, both 30, have been dating for several years and were engaged to be married last year. A wedding date has not been set, Russell's representative Jill Fritzo said.
Russell played the title role of Felicity Porter in the hit WB drama from 1998 to 2002. In 2006, she appeared opposite Tom Cruise in "Mission: Impossible 3."
Her new movie, the romantic comedy "Waitress," directed by the late Adrienne Shelly, will be screened during the Sundance Film Festival. The Cover Girl spokeswoman also will star later this year in "August Rush" with Robin Williams and "Girl in the Park" with Kate Bosworth.