Lady Gaga and Taylor Kinney may be engaged now, but their first interaction was not love at first sight. The 34-year-old actor, who is the star of NBC's hit series Chicago Fire, told Andy Cohen that Gaga slapped him the first time he kissed her on the set of the "Yoü And I" music video.

"I remember I went up, and we're rolling, and I kissed her and she didn't expect it," Taylor recalled. "They cut, and she slapped me. And it was just awkward. And the next take, I just did it again and then she didn't slap me. She didn't slap me then. We had a good time. I think there was chemistry. It was a late shoot. We were shooting until 4 or 5 in the morning. We exchanged information. A few weeks went by and we kept in touch and then that's that."

The couple got engaged this Valentine's Day after being together for more than three years.

"He put me on the back of his motorcycle and we drove away from all my security and he got in a lot of trouble," Gaga said of her first date with Taylor. "I just remember my helmet got all foggy because I was crying because I hadn't been outside by myself for so long. He hid me away in this little shack at the beach, where we made love all day long and then he introduced me to all his friends. And I'll never forget it because the one before him told me I would never make another friend, he told me I would die a rich old woman in a big house. With all my fame and no sense of the world. But not this guy. He told me that he was a gypsy too and if I wanted to we could go anywhere together or anywhere apart."

Catch Taylor Kinney on Chicago Fire every Tuesday on NBC.