The team of 'Kill Dill' is busy shooting for a quirky number titled 'Happy Birthday'. Going by its title, it is a celebration number and required a lot of cakes to be a part of the shoot. According to sources, to shoot the song the crew needed about 600 real cakes on the sets. And thanks to the dedicated team, everyone were spread in Pune, Mumbai and Navi Mumbai arranging for these cakes. 'Happy Birthday' song will star the entire cast of Ranveer Singh, Parineeti Chopra and Ali Zafar. And by the end of the shoot, the entire set smelt of yummy cakes. This number has been sung by Sukhwinder Singh.