Jai was shooting on his birthday (April 6) with Simbu for Vettai Mannan at Binny Mills near Chennai airport.
Ilayathalapathy Vijay too was shooting on an adjoining set action scenes for his Velayudham.
STR and Jai were shooting some deadly action scenes using seven cameras and 60 stuntmen. Suddenly STR realized it was Jai birthday and wanted to cut a cake.
STR thought of inviting Ilayathalapathy, but he was a little hesitant as he doubted whether the star would come. Remember that STR and Jai are big supporters of 'Thala' Ajith ?
When Vijay came to know about STR's dilemma, he immediately said he is coming over "to celebrate Jai's birthday".
All of them had a blast and the loudest clap was when Vijay gave a piece of the cake to his look-alike Jai.