Justin Bieber sings `Baby` with little girl in Moscow

Moscow: An amateur video captured during a Moscow performance of Justin Bieber`s ‘Believe’ world tour shows a heartwarming moment when the pop idol brought a little girl onstage and serenaded her with his hit song ‘Baby’.

"Gaby, you know my song `Baby`, right? You want to help me sing it?" Bieber asks in the video shot Tuesday and posted on YouTube by 19-year-old Vadim Petrov.

Bieber, who is also 19, is seen putting his arms around the girl wearing a white knit cap, who cries after being singled out from the thousands in attendance.

"Who wants to be my baby?" Bieber says to cheers as he takes the girl onto the stage at Moscow`s Olympic stadium, and struts and dances with her as he performs ‘Baby’.

Bieber also performed in St. Petersburg and Istanbul.