Capital FM have confirmed the final acts for both the Saturday and Sunday performance at the 2012 Jingle Bell Ball.
The Girls Aloud performance will mark their first live show since the girls reunited this year and could be a warm-up for their upcoming 2013 tour - which they had to add an extra London date to, due to demand.
The Girls Aloud 2013 tour begins on 21 February, at Newcastle's Metro Arena, which is the first of 14 live dates. The tour ends on 20 March at Liverpool's Echo Arena. It follows the release of their first comeback single, 'Something New', which the girls will perform for the first time on Children In Need this month.
Girls Aloud at the press conference, after announcing their reunion.
The annual Jingle Bell Ball event is taking place on Saturday 8 December and Sunday 9 December, and includes a lot of the most popular music stars, including Conor Maynard, JLS and One Direction.
Tickets are on sale now. For more information, visit Gigwise Gig Tickets.
The full line-ups are:
Saturday 8 December
Sunday 9 December
Watch the video for Girls Aloud comeback track 'Something New' below:
Below, ten years of Girls Aloud - what a difference a decade makes