While 'Engine Ki Seeti' is fast becoming a popular club track, Sonam Kapoor & Fawad Khan recently shot for a special promotional track titled 'Maa Ka Phone'.
 
Talking about the back story of the quirky song says Sonam, "I have this special ringtone for every time my mother Manju (Kirron Kher) calls me and it goes Ma Ka Phone Ma Ka Phone on loop. We liked the ringtone so much that we thought of weaving a fun track around it".

"In the film my mom calls me every two minutes to know what am I doing, how am I and all. She is a little clingy and even ruins my romantic moment with Fawad," she added further.

'Khoobsurat' is slated for a September 19th worldwide release.