Late Wednesday Seyfried's lawyers sent out a warning that the intimate photos of his client and her ex were stolen.
She then went on to become a regular in the primetime soap opera North Shore.
Hacked pictures of her and a separate batch images of fellow actress Seyfried have been posted on 'the dark web', a matrix of encrypted websites that allow users to surf with anonymity.
Last month, a hacker was sentenced to nine months in prison for hacking the electronic accounts of 30 celebrities including Jennifer Lawrence and stealing nude photos and information.
Seyfried is engaged and expecting her first child with Thomas Sadoski.
That dispute coincided with a public appearance by the star to promote the UN's HeForShe campaign, during which she hailed the possibility of the US electing its first female President.