Abhishek Bachchan and Aishwarya Rai treated fans and followers to a pleasant Diwali surprise when they arrived at ace designer Manish Malhotra's Diwali party, held in Mumbai last night, hand-in-hand. After years of speculation about their marital rift, the Bachchans made one of the rare joint appearances last night, making one of the most viral Diwali moments this year.