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.

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.