The SIMPLY THE BEST singer is staging her comeback at a fundraiser for London charity Cauldwell Children on 18 May at the city's Natural History Museum.
The 67-year-old is expected to perform a selection of her greatest hits.
She says, "I am delighted to be associated with a charity which reaches out to so many young people.
"If my songs make people dig deep into their pockets, then I will have achieved my aim."
Cauldwell Children provides treatment, therapies and vacations for poor and unwell kids across the UK.
Source: WENN