New Delhi, Mar 13 (ANI): Minister of State for Urban Development Babul Supriyo sang a Bollywood number for Delhi Chief Minister Arvind Kejriwal during an event in the national capital. The BJP MP, who yesterday shared the stage with Kejriwal during the launch of the NDMC app ‘NDMC311’, sang a song from the Bollywood movie 'Hum Tum', asking the Chief Minister that both the Centre and Delhi Government should work in tandem to work for development and prosperity of the people.