It all started with the big bang!

1. Kaley Cuoco (who played Penny) on her first red carpet in 2002:

2. Johnny Galecki (who played Leonard Hofstadter) on his first red carpet in 1989:

3. Jim Parsons (who played Sheldon Cooper) on his first red carpet in 2005:

4. Kunal Nayyar (who played Raj Koothrappali) on his first red carpet in 2007:

5. Simon Helberg (who played Howard Wolowitz) on his first red carpet in 2007:

6. Mayim Bialik (who played Amy Farrah Fowler) on her first red carpet in 1989:

7. Melissa Rauch (who played Bernadette Rostenkowski-Wolowitz) on her first red carpet in 2006:

8. Sara Gilbert (who played Leslie Winkle) on her first red carpet in 1989:

9. Kevin Sussman (who played Stuart Bloom) on his first red carpet in 2004:

10. Laura Spencer (who played Emily Sweeney) on her first red carpet in 2009:

11. Christine Baranski (who played Leonard’s mom Beverly) on her first red carpet in 1995:

12. Laurie Metcalf (who played Sheldon’s mom, Mary) on her first red carpet in 1993: