The Duke and Duchess of Cambridge were guests at Ms Fellowes' wedding in Snettisham, Norfolk, in 2009, and with just a year between their ages, the Duke and Ms Fellowes often played together as children.
The service will be conducted by the Archbishop of Canterbury, the Most Reverend Justin Welby, who also baptized Meghan and officiated her nuptials to rince-ha.
Middleton is expected to step out again for Prince Louis' christening.
The Prince was born Louis Arthur Charles at 11.01am on 23 April at St Mary's Hospital in Paddington weighing 8lbs 7oz.
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The announcement comes days after speculation that his Christening would happen between of June and first weeks of July.
How old will he be at his baptism?
GettyPrince Louis christening: How old is Prince Louis?
Louis will be wearing the same cream lace and satin gown worn by George and Charlotte.
The public will not find out the names of the chosen godparents until the day of the christening.
William's former private secretary Miguel Head is the other frontrunner at 2/1.
The minimum number suggested by the Church of England is three. The Duke and Duchess of Cambridge will share photos but will keep the occasion as private as possible.