Letter from Kennedy sister up for auction says Robert Kennedy and Marilyn Monroe were an 'item'

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Is there finally written proof that Robert Kennedy and Marilyn Monroe were paramours?

A letter up for auction from Kennedy sister Jean Smith to the sex siren contains the titillating line: "Understand that you and Bobby are the new item! We all think you should come with him when he comes back East!"

Read: Marilyn Monroe Lived in Fear of Getting Her Mother's Mental Illness

The two-page missive was written in the 1960s, when Marilyn was often seen in the company of Peter Lawford, a Kennedy brother-in-law and famously sang "Happy Birthday" to John F. Kennedy in a breathy voice and a barely there dress.

See images of the infamous actress:

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Marilyn Monroe's most iconic looks throughout the years
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Marilyn Monroe's most iconic looks throughout the years
NEW YORK, UNITED STATES - MAY 1962: Actress Marilyn Monroe singing Happy Birthday at the Democratic rally for President John F. Kennedy's birthday. (Photo by Yale Joel/Life Magazine/The LIFE Picture Collection/Getty Images)
Marilyn Monroe's 'Happy Birthday Mr. President' Dress Is Displayed At A Christie's Auction August 13, 1999 In Beverly Hills, Ca. (Photo By Getty Images)
American film star Marilyn Monroe (1926 - 1962) shares a joke with Jack Benny, comedian of radio, television and occasional films. Original Publication: People Disc - HW0707 (Photo by Keystone/Getty Images)
American actress Marilyn Monroe (1926 - 1962) stands in a staircase alongside a wall with a floral-motif pattern, late 1950s. She wears a black cocktail dress and dangling earrings. (Photo by Hulton Archive/Getty Images)
Marilyn Monroe, David Wayne, on-set of the Film, "How to Marry a Millionaire", 1953. (Photo via Alamy)
SOME LIKE IT HOT(1959) MARILYN MONROE, TONY CURTIS SLH 047P MOVIESTORE COLLECTIO LTD. (Photo via Alamy)
Marilyn Monroe, on-set of the Film, "There's No Business Like Show Business", 1954, TM and Copyright (c) 20th Century-Fox Film Corp. All Rights Reserved. (Photo via Alamy)
American actress Marilyn Monroe (L) with her husband baseball legend Joe DiMaggio. (Photo via AFP/Getty Images)

Marilyn Monroe with Joe di Maggio, 1953.

(Photo via Alamy)

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That beaded gown also is part of a trove of Monroe personal items up for sale and it's expected to fetch as much as $3 million at a Beverly Hills auction on Nov. 17.

Rumors of alleged affairs between Monroe and both brothers have swirled for decades.

Read: George H.W. Bush Will Defy Party With Vote For Clinton, A Kennedy Claims

The troubled actress died in 1962 from a drug overdose. JFK was assassinated a year later and RFK met a similar fate six years later.

Also up for bid will be her 1947 contract with Twentieth Century Fox, a recipe for stuffing, her final checkbook, a pair of strap sandals she wore in 1943 while still named Norma Jean and a negligee from the movie "Niagara."

The letter was discovered among papers Monroe left to her famous acting coach, Lee Strasberg. His son, David, found them packed into suitcases and cupboards.

Watch: Marilyn Monroe's Iconic Dress Worn For JFK's Birthday Could Fetch $3 Million at Auction

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