Kaley Cuoco as Penny Hofstadter – Then:
Penny is the only one of the girls who has been on "The Big Bang Theory" since the pilot first began airing in 2007. She is a very pretty, aspiring actress who financed her ambitions by working at The Cheesecake Factory. Leonard almost immediately developed a crush on her but never expected her to return his affections. To his surprise, Penny also developed feelings for Leonard, and after several roadblocks to their relationship, they eloped in Vegas in the ninth season.
