This is how innocent and girly "Penny" actress Kaley Cuoco looked like back in 2007. Did you know that the beautiful actress played the on/off girlfriend of "Leonard Hofstadter" in "The Big Bang Theory"?
Kaley Cuoco and Johnny Galecki also led a secret two-year relationship behind the scenes during their time on the set. The relationship eventually ended amicably in 2009, however. Meanwhile, Kaley is now happily married to tennis player Ryan Sweeting.
How cute! Jim Parsons looked so young at the beginning of the show. Until this very day, we know the neurotic "Sheldon Cooper" that way. The theoretical physicist learns only over time how to recognize sarcasm or even how to apply it himself. "Sheldon" is often very arrogant and overbearing and feels most intellectually superior - which he clearly shows - always.
There hasn't changed much over time, yet exactly that is "Sheldon's" charm: "Sheldon" most probably will never grow up. In real life, "Sheldon" alias Jim Parsons lives with his life partner in the former villa of Robert Pattinson, who sold the villa after the break-up with Kristen Stewart.
This is how young Johnny Galecki alias "Leonard" looked like at the start of the series in 2007. Thanks to his role as "Leonard Hofstadter", the actor achieved his big, international breakthrough and made it to the big screen.
You can somewhat definitely see the past decade on the actor's face. If that's because of "Sheldon's" exertive nature? Since the start of TBBT, Johnny Galecki could have been seen in many other Hollywood productions, for example in "Hancock" and "In Time".
Kunal Nayyar plays the Indian astrophysicist "Raj" in TBBT, who, in the beginning of the series, loses his voice in the presence of women, which called "Selective Mutism". In real life, Kunal is much better at communicating with women, however...
... and in December 2011 Kunal Nayyar even married the former Miss India. Congratulations!
When joining the TBBT-cast, Mayim Bialik has still been kind of a somewhat grey mouse. In the course of the series, the actress then found her personal style, though. She now shows up at her most attractive on public events...
... And this is how glamorous Mayim presents herself today. Seeing this, one would not think that she comes across that convincing in her role as a clinging neurobiologist "Amy".
At the start of the series, the "Howard" actor resembles his role still enormously. "Howard" is 26 years old at the time of the first season and lives with his mother, where he basically communicates through closed doors.
Today the actor looks much more grown-up and even very stylish. Simon has been married since 2007, welcoming his cute little daughter "Jocelyn" in 2012.