5 / 7

Kaley Can Keep a Relationship Secret

The actress admitted in September 2010 that she had a romance with her "Big Bang Theory" co-star Johnny Galecki. "We dated for almost two years. It was such a huge part of my life and no one knew about it," she revealed to CBS Watch Magazine. "This is the first time I've ever talked about it, ever. It was a wonderful relationship, but we never spoke a word about it and never went anywhere together."

Fun Facts About Kaley Cuoco

After the "Big Bang Theory" actress nabbed one of Hollywood's most eligible bachelors, "Man of Steel" star Henry Cavill, she was engaged to tennis pro Ryan Sweeting nearly four months later! Check out some fun facts about TV's "it" girl.