Johnny Galecki, star of The Big Bang Theory says his relationship with his on -screen girlfriend Kaley Cuoco is "special" and "intimate". Speaking with Watch magazine in the US the Roseanne actor, 38, said the couple, who call each other "Mooks" are still thick as thieves. "We're dear friends, she's not just an ex, she's a part of my life," he said. "We are two of the few who have had an intimate relationship and come out of it as even closer friends," agreed Cuoco, 28, who plays Penny on the hit comedy series. "He will always have a huge chunk of my heart and be my partner in crime," she added of the Chicago-born actor. Pictured: Johnny Galecki Splash News and Picture Agency does not claim any Copyright or License in the attached material. Any downloading fees charged by Splash are for Splash's services only, and do not, nor are they intended to, convey to the user any Copyright or License in the material. By publishing this material , the user expressly agrees to indemnify and to hold Splash harmless from any claims, demands, or causes of action arising out of or connected in any way with user's publication of the material.