They played romantic couple Penny and Leonard on the hit sitcom The Big Bang Theory, but Kaley Cuoco and Johnny Galecki revealed in 2010 they had a real-life romance for a period as well. Somehow, the ...

Kaley Cuoco and Johnny Galecki's on-screen chemistry was a big part of the charm of "The Big Bang Theory" — but what fans didn't know at the time was that a single Season 1 scene would spark a ...