Whilst his celebrity chums including Elton John and Sam Smith are both expected to attend, the singer’s nine children - ranging in age from three to 42 - will be acting as bridesmaids and best men.
Last night a guest said: ‘It is going to be a huge, incredibly fun wedding and Stevie is flying out all his nearest and dearest.
‘The guest list is pretty spectacular, and there will be a couple of surprise performances on the night.
‘Stevie has said he may well get up and perform a number, but hasn’t said what song yet.
‘There will be a huge party afterwards as well, and the whole day will be about love, laughter and family; Stevie is very close to his, and they will all have a role to play on the big day.’
Whilst Miss Brace will sign her wedding papers in the traditional fashion, the blind singer will be using two fingerprints to make proceedings official. The couple already have two children together.