Kaley Cuoco and Johnny Galecki Reveal the 'Big Bang Theory' Episode That Started Their Real-Life Romance

Kaley Cuoco and Johnny Galecki reveal why they kept their relationship a secret while filming

Kaley Cuoco & Johnny Galecki Reveal Why They Kept Their Romance Secret While Filming 'Big Bang Theory'

Kaley Cuoco: Johnny Galecki Worried Romance Would Ruin ‘Big Bang Theory’