The TV favourite has earned an estimated $29 million (GBP18 million) in the past year, and beats out co-star Johnny Galecki, who comes in at number two with a $27 million (GBP16.9 million) haul.

NCIS' Mark Harmon, The Big Bang Theory's Simon Helberg and Kunal Nayyar and Ashton Kutcher all tie for the third spot with $20 million (GBP12.5 million), while Kutcher's Two and a Half Men castmate Jon Cryer and Ray Romano both rank at seven with $15 million (GBP9.4 million).

Former Grey's Anatomy star Patrick Dempsey and Simon Baker come in at number nine with $12 million (GBP7.5 million) apiece.