Lehren Bulletin: Salman Khan To Have 'Koffee With Karan; Grand Masti' collects Rs 55 crore in opening weekend; Rani Mukerji opts out of Tigmanshu Dhulia's 'Begum Samru'; Salman Khan, Ranbir Kapoor to promote Mickey Virus; Karan Johar and Ram Gopal Verma's Twitter war; Madhuri Dixit do Zoya Akhtar's much delayed film and more hot news

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