N-Dubz are one of the acts playing Orange RockCorps this September.
The chart-topping hip-hop trio will join Pendulum, Mark Ronson And The Business Intl and Taio Cruz at London's Royal Albert Hall on September 24 for the gig, which encourages young people to volunteer their time in return for a money-can't-buy concert ticket.
"We loved performing and participating in Orange RockCorps last year in Manchester and we're honoured to be asked to perform again this time in London - it will be our first chance to ever play the Royal Albert Hall, so this is a special moment all round," said N-Dubz.
The Orange RockCorps, now in its third year, has already seen gigs by Busta Rhymes, John Legend, Kelly Rowland, Razorlight and Nas performing for 5,000 young volunteers.
Volunteers can register at www.orangerockcorps.co.uk or by calling 0800 954 7625.
Coverage from the Royal Albert Hall concert will be shown on Channel 4 and 4Music on September 26.