The 'accidental kiss' happened at the 2008 premiere of Amitabh Bachchan's most celebrated film - Paa. The event saw all the bigwigs of the industry in full attendance. Abhishek and Aishwarya played perfect hosts greeting each and every celeb personally. 

 

The picture was taken when Aishwarya and Abhishek were greeting the Devgns at the do. Aishwarya and Ajay Devgn have worked together in Sanjay Leela Bhansali's Hum Dil De Chuke Sanam which was the biggest blockbuster of the year. 

 

The picture it seems has been taken from such an angle from where it appears that Ajay and Aishwarya kissed as Kajol and Abhishek looked on.