Lily Allen is doing a gig at the Royal Albert Hall for children's charity Coram.
Other singers on the "unique line-up" include Charleston expert Sophie Ellis-Bextor and Maverick Sabre.
More artists will be announced 'soon', but it'll be before the concert's date, which is April 1.
Tickets go on sale January 10 (aka tomorrow) and will cost about £30.
(There will also be tickets priced at a slightly less reasonable £600, which gives you access to a 'premium box', a reception and some hospitality, ie booze presumably.)