They join Sir Tom Jones and Jessie J for the music and motoring festival in August.
Watch this wicked performance from the Radio 2 Piano Room.
The royals shake hands with Paddington and discuss marmalade sandwiches backstage.
The singer recalls her first concert and the trend for throwing unusual objects in the crowd at the time.
"I need to be better, I need to be healed and this is the right decision to make," she tells fans.
Singer says tests following surgery to remove her breast show no spread of the disease
The singer reveals she has undergone surgery and is now resting at home awaiting her results.
The singer says she will "disappear for a bit" to have surgery.
Tickets go on sale on Wednesday for Radio 2 in the Park, headlined by Bryan Adams and Def Leppard.
