Princess Olympia is studying in New York at the Parsons School of Art and Design and has modeled for several high-profile magazines and brands.
The Greek royal family's reign ended in 1973, but the family still hold their royal titles.
This means Princess Olympia can post photos you'd never see from Kate Middleton or Meghan Markle.
This week on the New Idea Royals podcast, Frances Sheen and royal expert Angela Mollard discuss what REALLY happened at Prince Louis' royal christening.
Listen below.