While Kaley Cuoco is currently pregnant with beau Tom Pelphrey’s child, she famously dated her "Big Bang Theory" co-star Johnny Galecki while the CBS sitcom was still on the air. The two dated for around two years before calling it quits in 2009, though the onscreen romance between Penny and Leonard lasted longer. Galecki and Cuoco are still close to this day, which is probably why the actress was comfortable sharing a makeout story recently.

In the new book "The Big Bang Theory: The Definitive, Inside Story of the Epic Hit Series" a slew of set stories about "The Big Bang Theory" were shared. Among them was this story from the actress from the time she was still dating Galecki. In the 2022 book, the actress opened up about getting “busted” hooking up in the parking lot!