2. Kaley Cuoco and Johnny Galecki
The Big Bang Theory‘s Penny and Leonard are a fans’ favorite. What most people don’t know is that co-stars Kaley Cuoco and Johnny Galecki began dating shortly after the show began. They secretly dated behind the scenes for about two years and didn’t make a big deal about it. Although things work out wonderfully between their characters Penny and Leonard, the same can’t be said for their IRL relationship.
Interestingly enough, Penny and Leonard ended up getting together after the two broke up in real life. Their characters even ended up getting married! It may have been a little awkward to keep playing a couple on-screen, but the two were able to keep it professional for 11 seasons. They’ve both commented on how they’ve remained friends and are an important part of each other’s lives.