No she is not because they are not royalty. Technically Kate Middleton is not a Princess either. Her official title is HRH Catherine, Duchess of Cambridge.
Middleton
probaly pippa u no kates sister
Princess peach does not have a sister, Princess Daisy is in fact another princess from Sarasaraland. In early concepts Princess Rosalina was meant to be Princess's Peach's sister but the idea was scrapped
Sister Princess was created in 2001.
Princess Atta's little sister is Princess Dot.
A princess's younger sister is still called a princess - like Princess Elizabeth, who became Queen, and Princess Margaret - who I think probably had more fun!!
kates
Princess catherine (sister-inlaw)
Joanne Kates has written: 'The Joanne Kates Toronto restaurant guide'
princess leia
The prince's sister has the title of "princess".
Princess catherine (sister-inlaw)