It happened while dancing with co-stars Amitabh Bachchan and Arshad Warsi.
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The actress was performing an item song on the stage at the gala event, wearing a semi-sheer dress with a black leotard underneath it. However, the actress did not realise that her wardrobe was a little haywire, exposing her derrière.
The malfunction didn't deter her spirits, though, and she danced away, with a big smile.
Aankhen 2 is the sequel to the 1993 thriller Aankhen, in which Amitabh Bachchan was the leading protagonist.
The film also marks the debut of Regina in Bollywood.
