Ekta Kapoor has chosen Gauhar Khan as the new-age Helen to dance on the popular cabaret number "Piya tu ab to aaja" in her upcoming venture "Once Upon A Time in Mumbai".

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Based on Mumbai's underworld in the 1970s, the film is being directed by Milan Luthria and stars Ajay Devgn in the lead role.

Raju Khan has been brought to do the choreography for what's touted as the most expensive cabaret ever shot in Bollywood.