The actress had been dating the beatmaker – real name George Barker – since July (09) but recently moved over to New York for her turn in Broadway production After Miss Julie.
And it seems the pair was unable to maintain their romance with the distance of the Atlantic between them, according to Britain’s Sunday Mirror newspaper.
A source tells the publication, “We had all hoped Sienna and George would be a long-term relationship. They always looked so happy together.
“But they realised it wasn’t going to last the distance with Sienna being out in New York with the play for the foreseeable future, so they agreed to part ways.
“Long-distance love isn’t something they were prepared to do and it was a mutual thing that they decided to part. They’ll remain pals and who knows what the future will bring?”