The astrologer told People magazine that Lili will have an outgoing, extrovert personality.
She explained: “She’s going to be super chatty and engaging as a personality.
“With the royal sign of Leo rising like Prince Charles, Camilla and Kate, she’s got the personal presence to be a star in her own right.”
The Duke and Duchess of Sussex chose Diana as Lili’s second name, in a nod to Harry’s deceased mother.
Ms Frank sees Lili sharing a lot of the emotional intelligence that her paternal grandmother used to have and developing a caring side to her nature.
The Duchess of Sussex gave birth to Lilibet Diana Mountbatten-Windsor on Friday, June 4 at 11.40am at Santa Barbara Cottage Hospital in Santa Barbara, California.
The Royal couple publicly announced her birth on Sunday, posting a statement to their Archewell website.
They thanked their fans for their support and said that Lili was “more than we could have ever imagined.”