One Direction Back Anti-Poverty Campaign
One Direction, Katy Perry and Kings Of Leon are among dozens of stars backing a new scheme to encourage young people to help fight global poverty.
The musicians are joining up to give away tickets to their shows this summer, in exchange for showing support for the Global Citizen initiative.
Music fans will be able to win tickets through a points system after registering with the scheme, by performing a variety of actions such as signing petitions, sharing content via social networking sites and contacting their local MPs about issues involving food and hunger.
The 1D boys said: "We are absolutely proud to join so many amazing artists to inspire people to take action to end extreme poverty."
It is launching in the UK after proving popular in the US, Australia and New Zealand with nearly 1.7 million "actions" having taken place worldwide.
The campaign has helped to increase funding of polio eradication and pledging more than £600,000 to community health workers in sub-Saharan Africa.
Around a fifth of the world's population are estimated to be affected by extreme poverty.
Bastille, Ed Sheeran, Franz Ferdinand, Russell Brand, John Newman and Jessie J are among the 100 artists already signed up.
More details can be found at globalcitizen.org/tickets.