People Exclusive

Gillian Anderson Welcomes a Son

Gillian Anderson Welcomes a Son
Gillian Anderson at premiere in London
Jon Furniss/WireImage

10/20/2008 AT 07:35 PM EDT

X-Files star 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 1-year-old son Oscar. Anderson also has a 14-year-old daughter, Piper, from a previous marriage.

To keep track of upcoming celebrity baby arrivals, visit Celebrity Baby Blog's Who's Due Next Gallery

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