She has contacted authorities after her mobile phone was hacked.
The 'Mad Men' star was left furious after discovering a hacker had bypassed the security settings on her handset and downloaded several images, including shots in which the busty redhead is scantily clad and not wearing make-up.
An alleged topless photograph of the 36-year-old actress appeared along with other shots on a website on Sunday but her representative has denied it is Christina in the pic.
Police are now investigating the matter.