Chipmunk and N-Dubz have been announced for the line-up at this year's T4 On The Beach.
The Diamond Rings rapper and the Playing With Fire stars will be headed for Weston-super-Mare for the July 10 summer party.
Jessie J, The Wanted, The View and Katy B are among those already announced to perform, with organisers promising more music acts will be revealed in the coming months.
Meanwhile, T4 has launched a new competition to find the ultimate T4 On The Beach Superfan, with the winner getting the chance to present on stage on the day.
Fans can upload a 30 second video of themselves to the T4 YouTube channel explaining why they should be crowned the champion, with the videos set to be judged by the T4 hosts. More details are available at www.channel4.com/t4.
T4 presenter Rick Edwards said: "The sun has finally got its act together and now the countdown to the big day is on. This year, we didn't think giving you some brilliant acts was enough so we wanted to make T4 fans a part of it too."