Celebrities are getting together for a year-long campaign to put pressure on governments to end world poverty.
Busted, Jamelia and Sugababes joined the Make Poverty History group, who want world leaders to give more aid and make trade fairer for poor people.
They also want governments to cancel the money that poor countries owe them.
The group, which includes more than 100 charities, unions and religious groups, have launched a white arm band for people to wear to show support.
Pressure on governments
They have chosen 2005 to push their cause as the UK is becoming president of the European Union this year.
That means Prime Minister Tony Blair will be in a strong position to make his voice heard, and they hope to make him speak for them.
U2 front man Bono said: "We can make extreme poverty history, I really believe that.
"The kind of stupid poverty where kids are dying for the lack of an immunisation that costs 20 cents, or lack of food in a world of plenty."