Medical records have revealed that Hollywood actress Marilyn Monroe underwent plastic surgery.

Six X-rays have put an end to speculation asking if the star had gone under the knife.

The documents, dated 7 June 1962, just one week after her 36th birthday and two months before her death, were written by plastic surgeon Michael Gurdin.

They refer to a cartilage implant in Marilyn's chin that he had inserted for a "chin deformity". Michael observed in the notes that the implant had begun to dissolve.

A facial X-ray also reveals a small fracture on her nose, suggesting that she may have had a nose job early on in her career.

A copy of Marilyn's X-ray which suggests the star had a nose job

The documents are going up for auction with the Julien’s Auction House in California with reports suggesting they may be sold for a figure between £10,000 and £20,000.

"Nobody really thought about Marilyn Monroe having plastic surgery” said Martin Nolan, executive director of the auction house, in conversation with Reuters. "It was all speculation – did she or didn't she? They thought she was such a natural beauty, they didn't want to believe it."

The director went on to explain "Everything added up — the timeline, the dates, the names, the addresses. I can tell you the seller also had a close relationship to the doctor.

"They [the medical records] are a part of pop culture history," said Nolan. "Worldwide, people have a love affair with Marilyn."