Kaley Cuoco, Johnny Galecki recall falling in love on ‘Big Bang Theory’ set

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Kaley Cuoco and Johnny Galecki pulled back the curtain on the moment they fell in love filming “The Big Bang Theory.”

The former co-stars, who dated in real life from 2008 to 2010, were “crushing on each other” while playing Penny and Leonard on the CBS show, according to excerpts from “The Big Bang Theory: The Definitive, Inside Story of the Epic Hit Series” published by Vanity Fair on Monday.

Cuoco, now 36, was “crushing so hard” on Galecki, 47, from the start — but their relationship reached a “turning point” during a particular scene.

The duo were filming Season 1 episode “The Nerdvana Annihilation,” which features Galecki’s character saving Cuoco’s from an elevator shaft in a dream sequence, when they “fell a little in love in that elevator shaft.”