VIDEO : Kaley Cuoco-Sweeting Wishes Ex-Boyfriend and ''TV Fiancé'' Johnny Galecki a Happy Birthday

Actress Kaley Cuoco-Sweeting took a moment to post an adorable black-and-white snapshot with her Big Bang Theory co-star and ex-boyfriend Johnny Galecki in honor of his birthday Thursday, captioning the picture, "Happy happy birthday to my tv fiancé and buddy buds for 8 years." Cuoco revealed in 2010, while Leonard and Penny were on the outs, that she and Galecki had dated on the down-low for two years. Cuoco said, "It was such a huge part of my life and no one knew about it."??