Her spokeswoman, Connie Freiberg, confirmed to The Associated Press on Tuesday that Anderson will give birth to her second child at the end of the year. The father is businessman Mark Griffiths, Freiberg said in an e-mail, confirming a report on People magazine's Web site.
Anderson, 37, has an 11-year-old daughter, Piper, with ex-husband Clyde Kotz, a production designer. She and her second husband, documentary filmmaker Julian Ozanne, separated in April after 16 months of marriage.
"The-X Files" ran from 1993-2002. Anderson starred as agent Dana Scully.
She and her daughter live in London.