The couple officially announced their engagement on Monday (November 27) and completed a full day of press-including a photo call and 20-minute sit-down interview, where we learned how Prince Harry proposed and what Princess Diana would've thought of Markle. The chapel itself has centuries of royal tradition and hosted the weddings of many members of the royal family.
Mr Knauf said the couple, who were grateful for the warm wishes from the public, would be putting their stamp on their wedding day. "The family has absolutely been solid support", Harry added.
No final date has been announced, and Kensington Palace is yet to reveal who will conduct the service, although it is likely it will be conducted by the Archbishop of Canterbury, Justin Welby.
He said they were delighted to be holding the wedding in the "beautiful grounds of Windsor".
"They will be making sure it reflects who they are as a couple", he said.
Mr Knauf revealed Ms Markle would begin formal royal duties nearly immediately, and would join Prince Harry at a series of public appearances in Nottingham, a midlands city three hours north of London, on Friday.
It's been a whirlwind 24 hours for Prince Harry and Meghan Markle.
Mr Knauf said Harry and Ms Markle "want the public to feel part of their day" - and are looking at ways to achieve that.
By contrast, Harry's bride-to-be Markle has been an outspoken critic of Obama's successor Trump, and at one point vowed to leave the United States for Canada if he won election. He said when she visited Buckingham Palace to meet the queen, "the corgis took to her straight away".
In 2005, the monarch attended the religious blessing of the Prince of Wales and the Duchess of Cornwall - both divorcees - in St George's, but did not go to their civil ceremony beforehand in the Windsor Guildhall.