"I couldn't be more proud of my boy @JamesArthur23 I love this song, it moved me to tears. (sic)," Nicole Scherzinger wrote on Twitter
A host of Bollywood celebrities attended including actors Preity Zinta and Sophie Choudry, Rashmi Nigam, actor Sanjay Kapoor's wife Maheep, designer Manish Malhotra and singer Nicole Scherzinger
Lewis Hamilton reportedly refused to marry Nicole Scherzinger
The celebrities take turns to sing a line from the John Lennon classic. Priyanka sings two lines in the song. The first, "imagine there's no countries," as a duet with model Suki Waterhouse, and the second, "a brotherhood of man," as a solo.