Gillian Anderson is sadly adding longtime love Mark Griffiths to her ex files.
"Gillian Anderson and her partner Mark Griffiths have amicably separated after six years together," a rep for the actress, 43, tells Us Weekly exclusively.
The duo, who never wed, share sons Oscar, 5, and Felix, 3.
The X-Files and House of Mirth actress has been married twice before. She and film art director Clyde Kotz, with whom she shares daughter Piper, 17, divorced in 1997; the star and documentarian Julian Ozanne were married for two years before parting ways in 2006.