The crowd was also played a video message from former England captain David Beckham.
After the Government committed to giving an extra £375 million to help feed the world's poorest children, Beckham said:
We've had good news. Earlier today the Prime Minister met with other world leaders and has made a real commitment to ending child malnutrition and hunger. There is more to do though and you can help.
More top news
Northern Ireland's abortion laws break the EU human rights convention, Belfast High Court has ruled.
Amid calls for new laws to regulate the size of models, we look at how the face of fashion has changed over the past 60 years.
Amid calls for new laws to prevent models getting too thin, ITV News speaks to three women in the fashion industry to get their views.