Jim Parsons (left) looked pretty sweet when he was young! This is him as a little boy with his mother and little brother.
Incredibly cute! The little girl is Melissa Rauch who we all know as...
... the somewhat bossy "Bernadette"!
Can you tell which cast member this cute little girl is?
... of course! It's Mayim Bialik alias "Amy Farrah Fowler"!
Two superstars for the price of one! Johnny Galecki and Neil Patrick Harris already acted together in numerous films when they were young.
Galecki became a household name as "Leonard Hofstadter" in The Big Bang Theory.
Can you recognize which actress is posing with her little sister here?
This cheeky smile is unmistakable: it is, of course, Kaley Cuoco!
This little tot learned to walk in Hollywood. His mother is a famous casting director and so Simon was often taken to film events from a very early age onwards...
The sweet boy in the previous photo is Simon Helberg who plays "Howard Wolowitz" in The Big Bang Theory.
Sara Gilbert (2nd from right) has worked as an actress since she was a child. Her first major role was in the cult series "Roseanne", in which, coincidently, Johnny Galecki also appeared.
Today Sara Gilbert is married to musician Linda Perry and still successfully present in the acting business. By now she is also the host of the show The Talk.
The Big Bang Theory has captivated millions of viewers around the world since 2007.
Luckily The Big Bang Theory has been renewed for several seasons more. Thank goodness!