Prince Louis will be christened next month.
Louis has not been seen in public since he was glimpsed outside the Lindo Wing on April 23, hours after he was born.
Little Louis will likely be christening in the same gown his siblings wore on their big day - a replica of the historic royal christening gown first worn by Queen Victoria's daughter, also named Victoria, in 1841.
"I have been the Patron of the [Defense and National Rehabilitation Centre] for 4 years and I have enjoyed every single moment of it", Prince William said.
Prince Louis' christening details have been revealed by Kensington Palace two months after he was born on April 23, 2018.
Prince Louis will be christened by the Archbishop of Canterbury, Justin Welby, on Monday 9 July, Kensington Palace has announced.
Louis will share his baptism location with George, but Charlotte, on the other hand, was baptized at the Church of St. Mary Magdalene in Sandringham.
Heir to the throne George was snapped in red shorts and a white embroidered top arriving for his sister's christening in July 2015.
It comes after Charlotte donned a pink floral dress while joining Kate and brother George to watch William take part in a polo match last week.
It's not yet known who Prince Louis' godparents will be, but punters seem to believe soon-to-be former private secretary Miguel Head and his childhood nanny Tiggy Legge-Bourke are favourites in the running.
Interested in Royal Family?James, Viscount Severn, was the first baby to wear the new outfit at his christening in 2008.
In early March, Meghan was baptized into the Church of England in a secret ceremony with Harry by her side.