A source tells the publication, "Keira is mortified to think anyone has been rummaging around her personal stuff. She feels violated and doesn't know if she wants to return to the flat."
Police are currently investigating the incident as the 25-year-old actress recovers from the shock on vacation.
A statement from London's Scotland Yard reads, "Officers from Westminster CID (Criminal Investigation Department) are investigating a residential burglary at the flat. It is believed to have occurred between 9am and 9pm on October 26. A forensic team from Westminster CID was dispatched to dust for any fingerprints or shoe marks left behind."