Shahrukh Khan and Aishwarya
It was during the shoots of 'Chalte Chalte', Aishwarya who was originally set to do the role was sent packing by Shahrukh Khan. This was mainly after Salman created a huge havoc on the sets while they were still dating. Rumour is, in spite of shooting over 50% of the film, Ash was replaced by Rani Mukerji overnite. This did not go down well with Aishwarya and since then the two actors have consciously never worked together.