Johnny Galecki and Sara Gilbert Used to Date in 1992
Johnny plays Leonard, one of the main characters of the show. While he is a geek, he also manages to land the good looking girls. In the real world, Johnny has quite a track record when it comes to dating.
Souorce: daily-choices.com
For those that remember him from Roseanne, he dated one of his on-screen girlfriends, Sara Gilbert for a short period in 1992. Later, Sara came out of the closet.