The 'Aishwarya's Eyes' performer sings the hook and plays the guitar on Loven's rap single.
"'Lost' combines the melancholic elements of acoustic guitar with an electro-bass sound and thought-provoking lyricism to bring you a powerful track that hits hard," said a statement.
"Rapper Loven, who produced the track, talks about the shift of money and power within society from the rise of the rich to the demise of those struggling, making this an eye opening piece of artistry backed by an innovative music video."
The song's promo was conceptualised by The Rajini Effect directors Kuvera and Nelson Sivalingam from Barking Mad Productions.
"The shoot involved working with 20 British Actors and CGI work to create the illusion of a glass cage with people fighting for money inside, in the middle of Trafalgar Square," the statement added.
Arjun's English language remake of CNN's Song of 2011 'Why This Kolaveri Di?' has had over six and a half million views on YouTube.
Watch the video for Loven and Arjun's 'Lost' below: