Shed Seven, The Subways and Cover Drive are also among the ten new acts that have been added to the festival's bill for the three-day music festival in Scotland between July 6 and 8.
Lloyd confirmed on Twitter: "performing at T In The Park in Scotland on July 6th, get your wellies out! (sic)."
Childish Gambino, Django Django, We Are Augustines, The Jezabels and Lawson will also appear.
The Stone Roses, Snow Patrol and Kasabian were previously announced as the trio of headliners for the event.
Tine Tempah, Florence + the Machine, Emeli Sandé, Noel Gallagher and The Vaccines have also been confirmed as performers.
Over 180 artists will play during the festival across 11 stages.
> Cher Lloyd: 'Popstars don't deserve to be treated like s***'
Watch the video for Cher Lloyd's 'Want U Back' below: