Gillian Anderson & Longtime Partner Split (Report)

Access Hollywood
Gillian Anderson and Mark Griffiths attend the UK Premiere of 'Mission: Impossible Ghost Protocol' at BFI IMAX in London on December 13, 2011 -- Getty Premium

Gillian Anderson is back on the market.

The former "X Files" star has split from her longtime partner, Mark Griffiths, her rep confirmed to People.

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The 43-year old actress and Griffiths, who began dating in 2006, have two sons together - Oscar, 5 and Felix, 3.

Anderson has a daughter, Piper Maru, from her previous relationship with Clyde Klotz (they married in 1994, but split in 1997).

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The actress then married documentary filmmaker Julian Ozanne in 2004, before separating in 2006.

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