Gillian Anderson, Partner Mark Griffiths Split

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.

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Following her role as Miss Havisham in a 2011 PBS miniseries adaptation of Great Expectations, Anderson has a full slate of projects in 2012: the films Mr. Morgan's Last Love, I'll Follow You Down and The Curse of the Buxom Strumpet, plus BBC miniseries The Fall.

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