We all know him from 'BBT', but who remembers him on 'Roseanne?' 🤔

Dated co-star Kaley Cuoco for about two years. 💑

Mayim & Johnny shared their first on-screen kiss back in the '90s. ❤️

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George Takei was his favourite 'BBT' cameo! 👍

Johnny's Chicago nickname is so strange! 😂

Check out more celebrity profiles of Rising Stars and superstars like Anna Nicole Smith, Aaliyah or Tom Ford. Find fun facts about their age, birthday, star sign, height, relationships and career highlights. Scroll through categories like Entertainment and Society or discover more Actors that are shaping today’s Movies.