Alicia Keys and Bono will be joined by Sting and Christina Aguilera
Stars including Bono, Justin Timberlake and Alicia Keys will perform in the Hope For Haiti TV fundraising event, organiser George Clooney has announced.
The actor said more than 40 celebrities were expected to attend the Hope For Haiti event on 22 January.
The aim of the telethon, he added, was "to show the people of Haiti that the whole world is paying attention".
Clooney and Haitian-born singer Wyclef Jean will host the benefit, to be shown on more than a dozen US TV networks.
Other performers will include Sting and Christina Aguilera.
Clooney attended the Golden Globe awards on Sunday, where he was nominated for best actor for his film Up In The Air.
Clooney attended the Golden Globes with Italian model Elisabetta Canalis
Asked whether it was "a bit odd" to be thrown into an awards show while trying to organise a charity concert, the star replied: "It is, except this is a perfect place for me to go recruiting some people, so it works out."
Organisers of the Globes pledged $100,000 (£61,400) to Jean's Yele Haiti Earthquake Fund and many of the night's guests used the opportunity to raise awareness of the ongoing relief effort.
Actor Mark Wahlberg said: "Haiti has been one of the poorest countries in the world for such a long time. And it's important for people to continue to help and change that."
Penelope Cruz added: "Everybody can use an opportunity to remind people to do something. Even if it's a little help. But everything counts."
The Hope For Haiti event will benefit the Red Cross, Unicef, Oxfam America, Partners in Health and Jean's Yele Haiti Foundation.
Clooney said songs from participating artists would be made available on iTunes, with proceeds going to the relief effort.
Estimates of the numbers killed by the earthquake range from 50,000 to at least 200,000.
Six days after the 7.0 magnitude earthquake, food and water are finally reaching some parts of the capital Port-au-Prince, but relief efforts are being slowed by bottlenecks.