United Kingdom, Feb. 13 -- Kaley Cuoco's fiance Tom Pelphrey has never watched her hit sitcom The Big Bang Theory.

The 40-year-old actress played waitress Penny in the long-running CBS sitcom which also starred Johnny Galecki as Penny's love interest Leonard Hofstadter, Jim Parsons as Sheldon Cooper, Simon Helberg as Howard Wolowitz and Kunal Nayyar as Raj Koothrappali.

Despite the popular comedy - which celebrated nerd culture and science - running for 12 seasons and 279 episodes from 2007 to 2019, and being watched by millions of viewers around the globe, Tom had never seen the show when he met Kaley.

Kaley has revealed Tom, 43, was very confused when the Guiding Light actor he took her to meet his family and his mother Laurie's part...