Matt Cardle and Emeli Sande have been added to the lineup for this year's T4 Stars concert.
The pair join a bill already consisting of Jessie J, The Wanted, Dappy, Pixie Lott and Ed Sheeran at the show, which will be held at London's Earls Court.
Professor Green, Example, Tinchy Stryder, Cher Lloyd, Wretch 32 and Rizzle Kicks will also play the gig, which takes place on December 11.
The main show will be hosted by T4 presenters Nick Grimshaw and Jameela Jamil. More special guests for the event are yet to be announced.
Casts from The Only Way Is Essex, Made In Chelsea, Hollyoaks and Misfits will be in attendance and will participate in a series of stage-based events.
Grimshaw and Jamil recently said that they are expecting to dress up as a pregnant Beyoncé or Lady GaGa's Joe Calderone for the show.
Tickets for the concert are on sale now.