One of Kaley Cuoco’s longest relationships was the one she kept secret. In 2010, the actress dropped a bombshell when she revealed to CBS Watch that she dated co-star Johnny Galecki, who plays Dr. Leonard Hofstadter, for nearly two years. “It was a wonderful relationship but we never spoke a word about it and never went anywhere together. We were so protective of ourselves and the show and didn’t want anything to ruin that,” she said.
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