Katharine McPhee is upset photos of her kissing married director Michael Morris were published online, People.com said.
Morris' wife, actress Mary McCormack, reportedly kicked him out of the house after he told her the images were about to hit the Internet last week.
"She's very upset," the source said.
"Katharine cares about Michael. But she still cares about Nick too. She didn't mean for anyone to be hurt."