Naaaw, he hasn't changed a bit either. The Big Bang Theory star, who came to public attention as Sarah Gilbert's boyfriend in Roseanne back in the extreme 90s, posted the below captioned: "#TBT @thesaragilbert #roseanne Love you dearly, Soap."
The pair, believe it or not, were 20-years-old at the time this photo was taken back in 1995, which - more disturbingly - makes them 40 now. WHERE does the time go, HAH?!
For those of you too young to remember, Galecki played David. Himself and Darlene had a baby together, and got hitched after college. You may recognise Sarah Gilbert better as Leonard's nemesis/lover Leslie Winkle.