The Big Bang Theory star Johnny Galecki has revealed he's "very, very happy" for his co-star and ex-girlfriend Kaley Cuoco after she revealed her [uuid=18c92ffd-a045-4d1a-aa18-61744a793d30]surprise engagement news[/uuid].

Galecki, who plays Leonard Hofstadter on the hit comedy show, told E! News that he was in New York when he heard about the proposal and spoke to Kaley soon after.

The actor revealed: "[I'm] very, very happy for her. She's very happy, which makes me terribly happy."