Prince Harry and Meghan Markle have arrived at the UN headquarters in New York ahead of his keynote speech.
The Duke of Sussex is expected to talk about Nelson Mandela's legacy, as well as speak to delegates about climate and poverty.
The 37-year-old's speech will be "around the memories and legacy of Mandela and what has been learned from his struggle and his life that can help up face the new challenges in the world today".