‘Big Bang Theory’ costars Kaley Cuoco, Johnny Galecki ‘just leveled up’

‘Big Bang Theory’ costars Kaley Cuoco, Johnny Galecki ‘just leveled up’Big Bang Theory co-stars Kaley Cuoco and Johnny Galecki reunited for a “serious upgrade.”The two, who dated off-screen during the show’s early seasons, appeared together on the screen for an…

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