Bollywood Megastar Amitabh Bachchan is turning 72 this Saturday and so the adoring son and daughter-in-law, Abhishek Bachchan and Aishwarya Rai Bachchan are throwing a huge birthday bash!

Aishwarya has been planning from the past few weeks and wanted to keep it a secret, but the cat is out of the bag, as Big B has already discovered her plans. It'll be a very exclusive affair, as only near and dear ones are invited for it.

Even though, Abhi is busy with 'Happy New Year' promotion and his newest venture of Indian Super League Team, Chennaiyin FC, the actor has helped Ash in planning the party. Big B's daughter Shweta has also flown down from Delhi for the celebration.

The party will be 100% Amitabh as all his favourite foods and soundtracks will set the mood of the party. In fact it is also heard that the guests will be performing on his famous tracks.

A source says, "This time, the Sr B's birthday falls on the same day as kaurva chauth, so it will be tough for Aishwarya to eat anything on that day but they still wanted to have the party so they decided to have the bash on the birthday eve."