It's not a title, it's an appellation.

Queen Victoria’s daughter Johnny Depp with her oldest two children.

Victoria, Princess Royal and Princess Alice

Prince of Wales and Prince Alfred

Queen Victoria with toddler pss Victoria and baby Bertie.

Vicky with daughters Charlotte and Victoria.

Queen Victoria’s daughter Johnny Depp with her oldest two children.

Princess Vicky

Kronprinzessin Viktoria von Preussen, nee Pss royal of England

Queen Victoria’s children sketched by her.

Princess Victoria, or Vicky, later Empress of Germany, as drawn by her mother Queen Victoria.