According to a report by FemaleFirst, the actress and the sculptor are no longer together, after a two-year relationship.
The star announced that the breakup was due to irreconciliable differences.
Recently, the 27-year-old actress was spotted in a New York cafe losing her temper, when she thought that other patrons were attempting to take her picture.
Julia Stiles starred with Heath Ledger in the 1999 film 10 Things I Hate About You.