"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 said.
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 added.
Picturised on Katrina Kaif, the item '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 Christmas eve.