A source told the magazine the romance couldn't survive the long distance and the New York-based actress and Hollywood actor ended it this month.
Segel recently signed up for a ninth and final season of the TV sitcom "How I Met Your Mother," which will keep him in Los Angeles.
Williams lives with Matilda, her 7-year-old daughter, in Brooklyn.
The little girl's father is the late actor Heath Ledger, who died in 2007 of an accidental drug overdose.
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