Gabriella Cilmi and dance trio Faithless have also been announced to perform at the one-day beach party, which is now in its sixth year.
They join over 20 other acts confirmed for the event, including Alexandra Burke, N-Dubz, The Saturdays and Pixie Lott.
T4 presenter Steve Jones said: "Just under two weeks to go - we're almost ready to rock and roll. The acts this year are yet again nothing short of sensational and I for one can't wait to get out there on stage.
"We're all getting our beachwear and sun tan lotion ready for the big day - let's hope for sunshine."
T4 On The Beach takes place in Weston-super-Mare on July 4. Tickets have sold out, but the event will be broadcast live on Channel 4 from 2pm.