Because the relationship was so new, the two hadn't told the rest of the cast they were dating yet, despite, as Galecki said, them being "our closest friends."
"So we would all be in the hotel lobby," he explained, "And Kaley and I would give each other a hug and pretend to say good night, and go our separate ways."
Eventually, series creator Chuck Lorre found out when Cuoco told him while the two were trying to make small talk.
"This is charming looking back, but I was on a shuttle bus with the cast and I was sitting next to Kaley trying to strike up a conversation," Lorre shared in the book. "The best I could come up with was, 'So ... what's going on with you? You got a fella? You seeing anybody?' Like, I'm her dad or something. And she starts giggling and says, 'Oh my God, you don't know?' And I said, 'I don't know what? What don't I know?' And she says, 'I'm seeing Johnny.'"
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