The 'X' Factor: Kareena and Shahid met on the sets of the 2004 romantic thriller 'Fida'. Although the film bombed at the box-office, sparks flew between the leads. The duo dated for three yeas before calling it quits in 2007. Ironically, their last film together 'Jab We Met' (the duo were rumoured to not be on speaking terms on the sets), ended up being one of the most successful films in their careers!