Marilyn Monroe once waited in line to meet Queen Elizabeth II.
Rare footage of the late Hollywood star, who would have turned 90 on Wednesday, recently emerged, revealing a moment when she met the Queen in London's Leicester Square on Oct. 29, 1956. At the time, both regal ladies were just 30 years old.
The meeting took place at the 1956 premiere of The Battle of the River Plate, a British war film. Monroe was there to accompany her then-husband, playwright Arthur Miller.
During the royal encounter, Monroe donned a strappy, silk dress with gloves as she shook the Queen's hand, curtseyed and smiled. Her Royal Highness looked equally as glamorous in an off-the-shoulder gown and sparkly Grand Duchess Vladimir tiara.
"The most moving, important thing about this shoot is that these were all her ideas," Leibovitz told the glossy. "She wanted to be photographed with her grandchildren and great-grandchildren; her husband, Prince Philip, the Duke of Edinburgh; her daughter, Anne, the Princess Royal; and her corgis."
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PHOTOS: See all the celebs who've visited with the Queen
Celebs Meet Queen Elizabeth II
Marilyn Monroe once met the Queen at a film premiere in London -- see the rare regal footage!
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Britain's Queen Elizabeth II (R) meets British actress Dame Helen Mirren (L) as television presenter Sir David Attenborough (3rd R) looks on during a Reception for the Dramatic Arts, at Buckingham Palace in London, on February 17, 2014. AFP PHOTO / YUI MOK/POOL (Photo credit should read YUI MOK/AFP/Getty Images)
LONDON, UNITED KINGDOM - DECEMBER 01: The Queen At The Royal Command Performance At The Victoria Palace Theatre On 1st December 1997 Shaking Hands With Pop Star Victoria Beckham (posh Spice) Of The Pop Band The Spice Girls. (Photo by Tim Graham Picture Library/Getty Images)
British actress Kate Winslet displays her CBE, for services to drama, which was awarded to her by Queen Elizabeth II, during an Investiture ceremony at Buckingham Palace in central London, Wednesday Nov. 21, 2012. (AP Photo/ John Stillwell/Pool)
Britain's Queen Elizabeth II (L) meets British-born actress Dame Angela Lansbury (R) during a Reception for the Dramatic Arts, at Buckingham Palace in London, on February 17, 2014. AFP PHOTO / YUI MOK / POOL (Photo credit should read YUI MOK/AFP/Getty Images)
LONDON - JUNE 02: Actor Patrick Stewart arrives to receive a Knighthood from Queen Elizabeth II, at Buckingham PalaceJune 02, 2010 in London, England. (Photo by Dominic Lipinski - WPA Pool/Getty Images)
LONDON, UNITED KINGDOM - FEBRUARY 17: Queen Elizabeth II meets Helena Bonham Carter during the Dramatic Arts reception at Buckingham Palace on February 17, 2014 in London, England. (Photo by Yui Mok - WPA Pool/Getty Images)
British actress Kate Winslet poses with her neck badge after being made a Commander of the Order of the British Empire (CBE) for services to drama by Britain's Queen Elizabeth II at an investiture ceremony at Buckingham Palace in central London on November 21, 2012. AFP PHOTO / POOL / JOHN STILLWELL (Photo credit should read JOHN STILLWELL/AFP/Getty Images)
Dame Elizabeth Taylor, right, stands with Dame Julie Andrews, the star of the movies Mary Poppins and Sound of Music, after they both received the honour of Dame Commander of the Order of the British Empire, from Britain's Queen Elizabeth II at a ceremony held in Buckingham Palace, London, Tuesday, May 16, 2000. (AP Photo/Michael Dunlea/POOL)
Hollywood actress Catherine Zeta Jones, right, and her husband Michael Douglas, with their children Dylan and Carys, arrive at Buckingham Palace in London where Catherine Zeta Jones will be invested with the royal award as a CBE (Commander of the Order of the British Empire) by the Prince of Wales, Thursday Feb. 24, 2011. The Welsh-born actress who became an Oscar-winning star will receive the honour for services to the film industry and to charity. (AP Photo / Lewis Whyld)
Britain's Queen Elizabeth II (L) shakes hands with Dame Helen Mirren (R) during a performing arts reception to celebrate young people, at Buckingham Palace, in central London on May 9, 2011. AFP PHOTO / POOL / Dominic Lipinski (Photo credit should read Dominic Lipinski/AFP/Getty Images)
Actress Angela Lansbury displays the insignia of Commander of the Most Excellent Order of the British Empire that she received from His Royal Highness the Prince Charles at the residence of the British Consul in Los Angeles, Monday, Oct. 31, 1994. (AP Photo/Lois Bernstein/Pool)
Queen Elizabeth II meets Sir Elton John backstage as British singer Robbie Williams (R) watches during the Diamond Jubilee Concert outside Buckingham Palace in London, on June 4, 20112. A chain of more than 4,200 beacons began to flare across the globe Monday to mark Queen Elizabeth II's diamond jubilee, with the last to be lit by the monarch at a star-studded concert at Buckingham Palace. AFP PHOTO / Dave Thompson /POOL (Photo credit should read Dave Thompson/AFP/GettyImages)
LONDON, ENGLAND - OCTOBER 26: (NO PUBLICATION IN UK MEDIA FOR 28 DAYS) Queen Elizabeth II invests Dame Judi Dench with the Insignia of a Companion of Honour at Buckingham Palace (Photo by POOL Tim Graham Picture Library/Getty Images)
Queen Elizabeth II meets author J.K. Rowling (Photo by Anwar Hussein Collection/ROTA/WireImage)
Britain's Queen Elizabeth II, left, meets actor Daniel Craig, the new James Bond, during the world premiere of the latest James Bond movie "Casino Royale" at the Odeon cinema in Leicester Square in London, Tuesday, Nov. 14, 2006. (AP Photo/Michael Dunlea, Pool)
Britain's Queen Elizabeth II, left, is greeted by England and Manchester United soccer captain David Beckham, right, at a reception prior to the opening ceremony of the Commonwealth Games in Manchester, England, Thursday July 25, 2002. Others are unidentified.(AP Photo/Phil Noble/pool)
LONDON - MARCH 16: (NO UK SALES FOR 28 DAYS) Hugh Grant meets Queen Elizabeth II at a banquet to honour the President of the Italian Republic and his wife Signora Ciampi during their state visit to the UK at Italian the Ambassador's Residence on March 16, 2005 in London, England. (Photo by ROTA/Anwar Hussein Collection/Getty Images)
Queen Elizabeth II meets French actress Catherine Deneuve at a Royal film Performance, 14th March 1966. Also present are (left to right) Christopher Lee, Ursula Andress, Woody Allen and Raquel Welch. (Photo by Hulton Archive/Getty Images)
4th November 1963: Queen Elizabeth The Queen Mother (1900 - 2002) talking to British pop group The Beatles after a Royal Variety Show at the Prince of Wales Theatre, London. (Photo by George Freston/Fox Photos/Getty Images)
WINDSOR, ENGLAND - APRIL 04: Queen Elizabeth II meets actor Christopher Lee at a reception for the British Film Industry at Windsor Castle on April 4, 2013 in Berkshire, England. (Photo by Steve Parsons - WPA Pool/Getty Images)
Britain's Queen Elizabeth II (R) meets Sir Paul McCartney backstage during the Diamond Jubilee Concert in London, on June 4, 2012. Britain's Queen Elizabeth II made a regal appearance at a star-studded diamond jubilee concert Monday but without her husband Prince Philip at her side after he was hospitalised hours earlier. AFP PHOTO / Dave Thompson/POOL (Photo credit should read Dave Thompson/AFP/GettyImages)
LONDON, UNITED KINGDOM - MARCH 14: Queen Elizabeth II (L) meets Annie Lennox following the annual Commonwealth Day Observance Service at Westminster Abbey on March 14, 2011 in London, England. (Photo by Leon Neal - WPA Pool/Getty Images)
LONDON, UNITED KINGDOM - JUNE 3: Queen Elizabeth II greets Penny Lancaster (2nd R) and Rod Stewart (R) during a reception for the Royal National Institute for the Blind at St James Palace on June 3, 2013 in London, England. (Photo by Jonathan Brady - WPA Pool/Getty Images)
British singer Tom Jones, right, shakes hands with Britain's Queen Elizabeth II, after the Royal Variety Performance at the London Palladium, England, Nov. 24, 1987. Also in the line up are entertainer Kenny Lynch, second right, singer Shirley Bassey, third right, and actor and songwriter Anthony Newley. (AP Photo/John Redman, WPA pool)
Queen Elizabeth II meets Sir Tom Jones backstage at The Diamond Jubilee Concert in London Monday June 4, 2012. Thousands of flag-waving fans gathered to watch British music royalty celebrate Queen Elizabeth II on Monday with a Buckingham Palace concert featuring acts from throughout her 60-year-reign. But the queen's husband, Prince Philip, missed the concert after being hospitalized with a bladder infection. (AP Photo / Dave Thompson, Pool)
LONDON, ENGLAND - MAY 23: HRH Queen Elizabeth II listens as Bono makes a citation at a special 'Celebration of the Arts' event at the Royal Academy of Arts on May 23, 2012 in London, England. (Photo by Carl Court - WPA Pool/Getty Images)
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FILE--Britain's Queen Elizabeth and ex-Beatle Paul McCartney watch a performance by students at the Liverpool Institute for Performing Arts in this June 7 1996 file photo. Paul McCartney is to receive a Knighthood at an Investiture cermony conducted by The Queen at Buckingham Palace later Tuesday March 11 1997.(AP Photos/PA, File) **UNITED KINGDOM OUT**
MANCHESTER, UNITED KINGDOM: Britain's Queen Elizabeth II receives the Jubilee Baton from six-year old Kirsty Howard accompanied by British soccer player David Beckham during 2002 Manchester Commonwealth Games opening ceremony 25 July 2002. Kirsty, who is seriously ill after being born with her heart back to front, is the mascot for the Francis House children's hospice which David and Victoria Beckham sponsor. AFP PHOTO DAMIEN MEYER (Photo credit should read DAMIEN MEYER/AFP/Getty Images)