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Rex Features
According to the New York Post, the pair's romantic scenes will "leave the audience gasping".
"It is extremely erotic. People will be blown away and even shocked," said a source.
"Penelope and Scarlett go at it in a red-tinted photography dark room, and the whole scene will leave the audience gasping."
Cruz and Johansson will also reportedly film a threesome scene with Javier Bardem.
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