Johnny Galecki celebrates his The Big Bang Theory co-star Kaley Cuoco's birthday. The pair, who played on-screen couple Leonard and Penny, were among the original cast members of the hit CBS sitcom alongside Jim Parsons, Simon Helberg, and Kunal Nayyar. After a turmultous on-and-off-again start to their relationship in early The Big Bang Theory seasons, Leonard and Penny got engaged in season 7 and were married in season 9.
Just a few months before The Big Bang Theory season 12 premiered, CBS
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