The pop star and Desperate Housewives actress have been approached to star in period piece Tipping the Velvet, to be directed by Sofia Coppola.
Based on a raunchy Sarah Waters novel, it tells the tale of an 1890s music hall star and her lover.
Longoria says, "Yes it's true, we're talking about doing that. It's such a wonderful novel, a beautiful love story.
Knowles adds, "We've had Brokeback Mountain so the time is right for this divine novel to get the same treatment."
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