"For us it was like, 'What the heck?' This has been blindsiding to us," she told FOX411, adding, "It has been weirdly stinging."
The actress, 38, who's been married to Pratt since July 2009, said that tabloid speculation that the hunky Jurassic World actor would cheat on her with his new Passengers costar Jennifer Lawrence were particularly hurtful.
"[That] stung a little bit harder than I thought it would," she told FOX411. "I have always kind of believed that part of the rumors of celebrity couples were sort of true – because they had never been a part of my life. I thought, 'Maybe there is a kernel of truth to that.' "
Regardless, Faris and Pratt, 36, are a team when it comes to co-parenting their son, Jack, 2.
"I am very lucky that I am with a man that we both value family," she said.
Watch Chris Pratt Get Choked Up Talking About His Son
Faris also teased potentially teaming up with her husband onscreen.
"I want to do all kinds of things, and my husband and I are working toward that goal," she told FOX411. "We are really hoping to act together in the right project. We are still trying to figure out what that is. But from the day we met, we have been fantasizing about it."