Princess Diana’s twin! Charles Spencer shares rare photo

Princess Diana’s twin! Charles Spencer shares rare photo

Princess Diana’s brother, Charles Spencer, has shared a photo of his mother – showing just how much she looked like Diana.

Royal fans could not help but point out the uncanny resemblance of Princess Di and her mother, Frances Shand Kydd.

Charles Spencer, Diana's younger brother, took to Instagram to share a stunning portrait of his late mother to mark her birthday on January 20.

The resurfaced image depicts a young Frances, with a blonde wavy bob, rosy cheeks and blue eyes.

"My mother - on this, her 85th birthday. She was born in Sandringham, Norfolk, on the very same day that King George V died - in the same parish," Charles wrote in the caption.

"She died 3 days after the 50th anniversary of her marriage to my father. This portrait is to be found in the Library at @althorphouse."

Charles is the 9th Earl Spencer and currently resides at Althorp House where the portrait is hung.

Fans were quick the point out how alike the mother and daughter looked.

"Looks just like the little one. The eyes are always the giveaway. Spencer genes are strong," one fan commented.

"So beautiful. You and Princess Diana look like her. ♥️" another said.

"'Beautiful, I can see where Diana got her stunning looks from," a third added.

Frances wed Earl Spencer Johnnie at just 18 years of age in 1954.

However the marriage did not last and the couple divorced in 1969.

She passed away at age 68 in her home in Scotland.

Charles was candid about his relationship with his sister in the two-part ABC television event, The Story of Diana.

The 53-year-old discussed his state of mind following his sister's untimely passing, admitting he partly blamed himself.

"I was furious, I wasn't just angry," he said. "[I thought] what could I have done.

“But you always think, God, I wish I could've protected her. It was just…it was devastating."

He then added: "I always felt…intensely protective towards her."