The sexy actresses will "leave the audience gasping with the steamy scene in the love of neighbor Vicky Allen Cristina Barcelona.
A source said: "It is extremely erotic. People will die and even shocked.
"Penelope Cruz and Scarlett Johansson to go to a red-tinted photography dark room, and the whole scene will leave the audience gasping."
Later in the film, the two women indulge in a trio with Penelope real-life friend Javier Bardem.
This is not the first time that Penelope has pushed the boundaries sex on the screen.
In the video clip of his brother Eduardo Cruz de la chanson Contaro Cosas Que? Penelope locked lips with a woman who was originally thought to be the sister of Monica.
However, representatives of the Spanish actress later revealed the woman was a look-a-like.
Vicky Barcelona Cristina tells the story of a painter, played by Bardem, who falls into a relationship with two tourists, played by Penelope and Scarlett.
It should be released later this year.