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    Kaley Cuoco And Johnny Galecki Can Pinpoint The Exact Moment Filming “The Big Bang Theory” That They Fell In Love

    Kaley Cuoco and Johnny Galecki secretly dated from 2006 to 2008.

    Kaley Cuoco knows exactly when she and Johnny Galecki fell in love on the set of The Big Bang Theory.

    A closeup of Kaley and Johnny

    The costars, who secretly dated from 2006 to 2008, recently opened up about their relationship in a major way — and spilled the details of the early days of their romance.

    A closeup of Kaley and Johnny

    Although Kaley admits she had a crush on Johnny from the very beginning, at the time, they were both in relationships.

    A closeup of Kaley and Johnny

    "All the scenes up until we actually got together in real life, it was obvious there was always something there. There was chemistry, and we were crushing on each other," Kaley said in an excerpt from The Big Bang Theory: The Definitive, Inside Story of the Epic Hit Series.

    A closeup of Kaley and Johnny

    While she says she was "very nervous" the first time their characters Penny and Leonard kissed during Season 1, it wasn't locking lips that sparked their IRL connection.

    Penny and Leonard kiss on the show

    Looking back, Kaley says it all went down while filming "The Nerdvana Annihilation" episode where there was a dream sequence that Leonard saves Penny in an elevator shaft.

    Leonard looks over at Penny and smiles

    "We had to be in each other's arms — and for quite some time, because it was a bit of a stunt that we were doing. ... That was certainly one of the moments that I think—," Johnny said before Kaley added, "I think we fell a little in love in that elevator shaft."

    Leonard holds Penny in his arms in a bedroom

    Johnny says the episode marked a "massive turning point" in their relationship, and they both knew that "something mutual was felt."

    A closeup of Kaley and Johnny

    "It was going to be more of a distraction from the work to try and continue to ignore it than to actually recognize it and surrender to it," Johnny said.

    A closeup of Kaley and Johnny

    Kaley went on to split from her boyfriend, but it took a little bit of time for the couple to make things happen between them off screen.

    A closeup of Kaley and Johnny

    Immediately following her breakup, Johnny turned Kaley down during a cast trip because it felt too "premature," but he eventually made the first move and invited her out for drinks.

    A closeup of Kaley and Johnny

    "We kissed at the bar! It’s so dark in there that you almost feel like you can do anything, but then it was like, Uh‑oh, I think this is really going to be bad. We started kissing in the bar area, and then we were kissing in the parking lot," Kaley said.

    A closeup of Kaley and Johnny

    While Kaley says she would have told "everybody the next day," Johnny wanted to keep things private — so, the couple hid their relationship from the public for years.

    A closeup of Kaley and Johnny

    Ultimately, their different views about sharing their relationship "created a chasm" between them and contributed to their eventual split.

    A closeup of Kaley and Johnny

    Thankfully, they were able to remain friends and continue on with their onscreen relationship despite breaking up.

    You can read the full excerpt about their relationship here.