/> That song! Rishi Kapoor dancing to the incredibly catchy beats of R.D Burman's Bachna ae haseenon lo mein aa gaya in Hum Kissi Se Kam Nahin.

Tomorrow, that's Thursday, Siddharth Anand along will start shooting a music video in support of his film Bachna Ae Haseenon. It will feature Ranbir with all his lovely leading ladies Bipasha Basu, Minissha Lamba and Deepika Padukone. And yes, for nostalgia's sake Rishi Kapoor might join in too.

"Though I'm too scared to ask him as yet, " laughs director Siddharth Anand. "The only time Yashraj have done separate music videos for their films is for Dhoom. It's the project that determines the promotion. I think we had a great title song and it was waiting to be used as a music video."

Siddharth says the original song's opening has been retained. "We have used the song from Hum Kissi Se Kam Nahin by Kishore Kumar at the beginning of the track.

Then we got Kishoreda and Leena Chandavrakarji's son Sumeet to sing the rest of the song as an original composition. So it'd be quite an emotional and nostalgic trip. Kishoreda's son sings for Chintuji's son."

Siddharth insists that the rest of the track has been completely re-worked by Vishal-Shekhar. "It's not a remix at all.

The track takes off from the original in a totally different tangent.We had taken a conscious decision not to use the song unless it turned out as special as we wanted it to be. We're really proud of how the title song has turned out."

And now Siddharth starts shooting with choreographer Ahmed Khan. "From tomorrow, all of us Ranbir, Bipasha, Minissha and Deepika and Ahmed are getting completely engrossed in the shooting the video."

Interestingly Ranbir Kapoor tried to sing his father's song but gave up the idea.

Says Siddharth, "We did try Ranbir's own voice for the track. He does have a great singing voice. But we were in a hurry and we didn't want to make it overly gimmicky.

I think I'll keep Ranbir's singing for posterity...I'm actually really nervous about Bachna Ae Haseenon. Everyone talks about his film being different. So I'm hesitant to use that word.

Like Salaam Namaste, Bachna Ae Haseenon is a trueblue romantic comedy. But I'm confident. Ranbir is exceptionally talented."