The ceremony will take place at The Chapel Royal, St James’s Palace, in London. The 11-week-old, who is fifth in line to the throne, will be christened by The Archbishop of Canterbury, Reverend Justin Welby.
Prince George, four, and three-year-old Princess Charlotte will be there for their younger brother’s big day. It will be the first time the Duke and Duchess of Cambridge and their three children have been seen together as a family of five.
He will reportedly be dressed in the same cream gown used for George and Charlotte. The robe is a replica of the lace and satin dress made for Queen Victoria’s eldest daughter in 1841.
Prince Louis’ godparents, who will be announced on the day, will take part in the 40-minute traditional religious ceremony.
Princess Charlotte was christened at St Mary Magdalene church on the Queen’s estate in July 2015.
Prince George’s christening took place in the Chapel Royal at St James’s Palace in October 2013, five months after he was born.
Both George and Charlotte were both also baptised by the Archbishop of Canterbury.
Louis Arthur Charles was born in the private Lindo Wing of St Mary’s Hospital in Paddington, London, on April 23 – St George’s Day – weighing 8lb 7oz.