Salman Khan's cameo in KKHH, Kajol in Gupt: Watch Bollywood's best kept secrets

Last year when Salman Khan's Tubelight released it had a cameo by Shah Rukh Khan. Similarly, we already aware of the fact that Shah Rukh Khan's next Zero will have a cameo by Salman Khan, here is a list of some of the Bollywood film's best-kept secrets.  

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