Stars including Billie Eilish and Ed Sheeran are set to perform at a 24-hour concert to raise awareness of climate change, vaccine inequality and famine.
The Global Citizen festival will see performances from more than 60 artists in New York, London, Sydney and beyond.
Tens of thousands of people are expected to attend, while millions are likely to tune in to the broadcast.
The event kicked off today (Sat) in Paris, where Elton John performed in front of the Eiffel Tower.
The show, believed to be one of the biggest-ever international charity events, was organized by the non-governmental organization (NGO) Global Citizen.
