PSY, James Arthur Added To Summertime Ball Line-Up
Rizzle Kicks, Union J & many more have also joined the party...
In total, 21 acts are due to perform at the bonanza - the most ever to take to the stage at the Summertime Ball in one day.
The likes of Justin Bieber, Cheryl Cole and Usher performed at the concert in 2012.
Tickets for the Capital FM Summertime Ball are on sale now.