One Direction, Jessie J, Bastille and McBusted are backing a new scheme to encourage young people to help to fight global poverty.
The chart topping stars have joined up with some of the UK's most popular festivals to give away tickets to their shows this summer, in exchange for showing support.
They join more than 100 well-known names who are already backing the Global Citizen initiative, including Katy Perry and Kings Of Leon.
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, helping 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.
All Saints, Ed Sheeran, Franz Ferdinand, Russell Brand, John Newman and Chvrches are among the 100 artists already signed up. More details are at globalcitizen.org/tickets.