"Diva and Anya keep singing and dancing to the song all day - Czar on the other hand attempts to play the track on his drums," a source says.
The triplets will turn three in February next year.
"It's a very cute sight. In fact. while Shirish (Kunder) was composing the music for the title track, Czar would accompany him to the studio and it's also no secret that he has the biggest crush on Katrina Kaif," the source adds.
Picturised on Katrina Kaif, the item number Sheila Ki Jawani is on its way to give competition to Munni Badnaam Hui of Dabangg.
Farah Khan's action comedy Tees Maar Khan starring Akshay Kumar and Katrina Kaif will hit the theatres on the Christmas eve.
Source: IBN Movies