The 31-year-old saw that the two-year-old was in a bad mood after she was stopped from playing with a polo stick, so he decided to cheer her up with a tickle attack.
This clearly put a smile on young Mia's face.
The toddler previously gained some attention when she was seen holding her great-grandmother’s Launer handbag in the Queen’s birthday portrait.
"It ended up being a great photo of her,” Mia’s father Mike Tindell said, as he described the picture on Good Morning Britain.
Although she is only two years old, he has already discussed whether he would like to send her to a boarding school like many others in the royal family.
"Personally, I'd rather she attend a school that's nearby, where we'll always be on hand if she needs us," he told Daily Mail. "Anything else goes against my instincts."