Katti Batti's 'Lip to lip' song is touted to be the first song in India where stop motion technology has been used. Kangana and Imran are said to have kissed each other for a collective 24 hours over a period of three days in order to get the right frame for the song.
Explaining the use of special technology in the song, Imran said, "We have shot Lip to lip using stop motion animation, which is very time intensive because you have to get it right per pose. When you move a little bit then another frame and it goes on. After they animate it, it looks like smooth motion. So we had to start to kiss and they had to take frames one after another as a hundred things would move around us."
Though it is not the first time Imran is going to be seen kissing his co-star on screen, he considers Lip to lip as 'physically demanding'.
"It was very exhausting. It looks gorgeous, but it's one of the most physically demanding thing that I have ever done because holding the body in that position static through the day and not moving at all. At the end of every day, we felt like our back was about to break," he added.
