Michelle Williams and Jason Segel have reportedly split up.

The My Week With Marilyn actress and the How I Met Your Mother star called time on their romance a few weeks ago after dating for more than a year, according to US reports.

It's thought the long distance between the pair was behind the break-up - Michelle is based in New York with her seven-year-old daughter Matilda, from her relationship with the late Heath Ledger, and Jason lives in LA.

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However, neither star has commented on the split.

Michelle, 32, stared dating Jason, 33, early in 2012 after they were introduced by the actress' Dawson's Creek co-star Busy Philipps, who starred with Jason in Freaks And Geeks.