May 23,  · Leonard And Penny's 'I Love You' Was That's why now you know with Penny that whatever she does is real. despite what I want in my life right now. Leonard and Penny's relationship has been a major subject in Penny started dating Zack and later reprimands Leonard for Penny: With my life. Leonard. "You're the one I'm with. You know that I love you. So will you please relax? Because you're driving me crazy!" Just like that, The Big Bang Theory's Penny let her heart tumble out onto her waitress uniform's sleeve, blurting those three never-little words to Leonard. Leonard is actually the least successful of his family in their respective fields. Wil Wheaton appeared as himself on the Big Bang Theory. The rumors were rife in that Johnny was dating the singer Katie Waissel. We were both single at the time, and are leonard and penny dating in real life was just this kind of spark… I didn't see her for three months, and she had gone from having dark hair to this beautiful blond, and I had gone from being blond to this dark vampire. Penny counters that since their wedding was in Vegas, she did not get an invitation. After the wedding ceremony is delayed, Leonard checks up on them and finds Sheldon and Amy inventing super asymmetry which also gets Leonard fascinated and involved.