The 32-year-old singer is set to marry art dealer Caspar Jopling in a star-studded affair.
Other royal family members invited to the nuptials include Princess Beatrice, Princess Eugenie, and their mum, Sarah Ferguson.
Reports claim the ceremony will either York Minster Cathedral or a chapel in Yorkshire. A VIP reception will follow at Castle Howard.
Harry and Ellie are believed to have dated for two-years before calling it quits in 2014.
The songstress was the wedding singer at William and Kate’s wedding. She sang 14 songs at the event held at Buckingham Palace, which ended at 1:30am.
RELATED: WATCH MEGHAN ATTEND POLO WITH BABY ARCHIE