The sisters, now known as Justin Bibis, grew up in a poor neighbourhood in the outskirts of Lahore and say they listened to the song 70 times before transcribing it into Urdu and memorising it off by heart.
Muqqadas said: “When I heard the song I forgot to eat or drink. I was just listening. I kept practising and practising until I learned it by heart.”
The girls, who were taken out of school because they were too poor, say they now hope to meet Justine Bieber. They have already appeared on local television to perform live.
“We really didn’t expect all of this to happen to us, to be famous like this. Because of this video we got on a plane for the first time and we’ve been on TV. That’s always been our dream,” the sisters added.