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Two of Hollywood's most lusted after actresses Scarlett Johansson and Penelope Cruz are set to steam up screens with a lesbian kiss.

The scene, set in a red-tinted photography dark room, features in Woody Allen's upcoming release Vicky Cristina Barcelona. Later, the women have a menage a trois with Oscar winning actor Javier Bardem.

This is not the first time that Cruz is sharing an on screen lesbian kiss.

Allen's muse Johansson plays Christina, one of two American backpackers in Spain who get involved with a painter (Bardem), and his jealous ex-girlfriend, played by Penelope Cruz.

"It is extremely erotic. People will be blown away and even shocked," the Daily Telegraph quoted a source, as telling the New York Post's Page Six column.

Cruz and Bardem's on screen chemistry was more than just fine acting - the pair sparked a romance while filming the movie Barcelona in their native Spain last year.

There are even rumours Bardem, who won an Oscar this year for his role in No Country For Old Men, proposed to the actress during a recent trip to France.

Both Johansson, who became engaged to actor Ryan Reynolds last week, and her costar Cruz are expected to attend the Cannes Film Festival this week to promote the new film.