The 29-year-old beauty was asked that very question during an appearance on Watch What Happens Live on Sunday, where she admitted she dodged a bullet with what could have been a "horrible" situation.
"Well, we dated like 5 years ago," she said of Galecki, who even attended his co-star's wedding on New Year's Eve 2013. "So I think we've both moved on. And Johnny's actually one of my best friends. It's a situation that ended well. I understand sometimes it doesn't."