There is no definitive answer to this question. The existence of dimples is a physical trait that varies greatly among individuals, and there is no official record of which princesses have dimples.
Dimples are a common feature, and many princesses throughout history likely possessed them. It's important to remember that beauty standards and the focus on physical characteristics have evolved over time, and there is no single "ideal" princess.
The question itself may be based on a specific princess or a fictional character. If you have a particular princess in mind, you could research her portraits or descriptions to see if there is any mention of dimples.