Mika Singh who is currently on a world tour celebrated Amitabh Bachchan's 70th birthday in Detroit in the US by cutting a cake amidst a crowd of 50, 000 people

The singer says, `Bachchan Saheb ke liye kuch bhi... kaha bhi.` Apparently at his show he spoke about Big B's recent birthday celebration and the crowd would have nothing but tell him to render the star's tracks.

Mika then ordered for a cake and the crowd sang Happy Birthday to the Big B.