Hot X-Files actress Gillian Anderson, 39, is pregnant with her third child. Anderson has a daughter, Piper, 13, from her first marriage, and a 2 year-old son, Oscar, with her boyfriend, director Mark Griffiths.

Anderson was married to her second husband, documentary filmmaker Julian Ozanne, for 16 months before they announced their separation in April, 2006. She had her second child, reportedly by her current boyfriend Mark Griffiths, in November 2006. You can do the math, but maybe she decided to wait before making it known that she was separated from her second husband.

Anderson will next appear in the much-anticipated X-Files sequel, The X-Files: I Want to Believe, which is out in the US on July 25.

Congratulations to Anderson and Griffiths!

Gillian Anderson and Mark Griffiths are shown outside an Esquire Magazine event on 5/28/08 and in Cannes on 5/14/08, thanks to WENN.