Kate Middleton allegedly spotted dancing at her brother's wedding.

James Middleton shared a Mother's Day post on Instagram with his mother Carole.

Fans claimed to have spotted Kate in the background of the photo.

The lady in the photo was wearing a short-sleeved white dress.

Fans identified her as Kate Middleton.

Kate and Prince William along with their children flew to the South of France for James' wedding.

The wedding reportedly took place in September 2021.

Kate's appearance on the dance floor delighted royal fans.

The Middletons are a close-knit family and often share their special moments on social media.