Marilyn Monroe’s medical records, which include a physician’s notes showing that the actress had undergone cosmetic surgery, along with a set of X-rays, will be auctioned off next month, Julien's Auctions, a Beverley Hills-based auction house, said on Tuesday.

The auctions, scheduled to take place on Nov. 9 and Nov. 10, are expected to fetch between $15,000 and $30,000. In a 2010 auction, a set of three X-rays of Monroe’s sold for $45,000, according to Reuters.

The identity of the seller has not been revealed, and reports indicate that the items that are up for sale -- medical records of Monroe between 1950 and 1962 -- were gifted to the seller by Hollywood plastic surgeon, Michael Gurdin.   

"Nobody really thought about Marilyn Monroe having plastic surgery. It was always speculation - did she or didn't she?" Martin Nolan, executive director of Julien's Auctions, told Reuters. "They thought she was such a natural beauty, they didn't want to believe."

“Also at that time, going back to the 1950s, people didn't go for plastic surgery procedures," Nolan added. "This is very, very new."

Citing notes made by Gurdin, his medical partner, Norman Leaf, had published a memoir in 2010 where he said that Monroe underwent cosmetic surgery on her chin in 1950, besides a rhinoplasty procedure on the tip of her nose.  

According to Reuters, the X-rays are dated June 7, 1962 -- two months before she died from an overdose of barbiturates at the age of 36, and one day prior to being fired by 20th Century Fox studio for her constant absence while filming “Something’s Got to Give.”

The X-ray records also show that Monroe weighed 115 pounds and she was five foot six inches tall, and doctors used an alias -- Joan Newman --  for the actress' procedure.