Kate Middleton's 'ONE' guilt turns into sweet gift for Princess Charlotte

Kate Middleton fulfilled a special promise to Princess Charlotte amid cancer recovery. 

The Princess of Wales reportedly felt a sense of guilt for not spending as much time with her children as she wished, due to the exhaustion caused by her illness. 

Kate, is a regular fixture at Wimbledon and is also expected to appear in the Royal Box again this year. 

Last year marked a special moment for Princess Charlotte, who made her debut at the iconic tournament. It was a promise Kate had made her daughter-to take her to to the finals as a memorable treat. 

Speaking to The Sun, royal biographer Ingrid Seward shared: 'Kate felt guilty she had not been able to spend as much time as she would have liked to be with the kids because of her exhaustion after her treatment.' 

During the appearance, young Princess Charlotte was praised by body language expert Judi James, who described her as Kate's 'wing-girl.' 

Speaking to The Mirror: 'Charlotte is still showing signs of being her mother's wing-girl. She is now grown up enough to walk independently beside or behind her mother, with Kate only performing a small, loving loving touch on the back to bring her forward for her handshakes,' reports Gloucestershire Live. 

Wimbledon kicked off this Monday and will run through Sunday, July 13.