Gillian's A Mom Again!
Posted at 5:40 AM (PDT) on Tuesday, October 21, 2008

Gillian Anderson and boyfriend Mark Griffiths are parents of a baby boy, the actress's rep tells PEOPLE exclusively.

Felix Griffiths, weighing 6 lbs., 15 oz., was born Oct. 15 in London, says rep Kelly Bush.

Felix is the second child for Anderson, 40, with Griffiths, joining their almost 2-year-old son Oscar. Anderson also has a 14-year-old daughter, Piper, from a previous marriage.