Amal Clooney dons unexpected accessory with husband George Clooney at Buckingham Palace

It was a royal night out for George and Amal Clooney.

The A-list couple stepped out for a private dinner in honor of The Prince's Trust at Buckingham Palace on Tuesday night in London, which was hosted by none other than Prince Charles.

The star-studded event, which also boasted Benedict Cumberbatch, Luke Evans, Chiwetel Ejiofor and Josh Hartnett as guests, was held for donors of the aforementioned trust, which is dedicated to provide aide to underprivileged youth who are either unemployed and looking for an education.

SEE ALSO: Amal Clooney makes rare outing with her twins: Photos

For the event, Amal opted for a strapless white Jean-Louis Scherrer gown by Stephane Rolland from William Vintage, which she paired with a chic asymmetrical cape and an unexpected beaded sleeve on her left arm. The human rights lawyer's actor husband looked dapper as ever in a classic tux and burgeoning beard.

See photos of the couple at Buckingham Palace:

49 PHOTOS
George Clooney and Amal Clooney together
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George Clooney and Amal Clooney together
LONDON, ENGLAND - MARCH 12: Amal Clooney and George Clooney attend a dinner to celebrate The Prince's Trust, hosted by Prince Charles, Prince of Wales at Buckingham Palace on March 12, 2019 in London, England. The Prince of Wales, President, The Prince’s Trust Group hosted a dinner for donors, supporters and ambassadors of Prince’s Trust International. (Photo by Chris Jackson - WPA Pool/Getty Images)
LONDON, ENGLAND - MARCH 12: Amal Clooney and George Clooney speak to Prince Charles, Prince of Wales as they attend a dinner to celebrate The Prince's Trust, hosted by Prince Charles, Prince of Wales at Buckingham Palace on March 12, 2019 in London, England. The Prince of Wales, President, The Prince’s Trust Group hosted a dinner for donors, supporters and ambassadors of Prince’s Trust International. (Photo by Chris Jackson - WPA Pool/Getty Images)
LONDON, ENGLAND - MARCH 12: (L-R) Chiwetel Ejiofor, Luke Evans, Tamsin Egerton, Josh Hartnett, Benedict Cumberbatch, Amal Clooney and George Clooney attend a dinner to celebrate The Prince's Trust, hosted by Prince Charles, Prince of Wales at Buckingham Palace on March 12, 2019 in London, England. The Prince of Wales, President, The Prince’s Trust Group hosted a dinner for donors, supporters and ambassadors of Prince’s Trust International. (Photo by Chris Jackson - WPA Pool/Getty Images)
LONDON, ENGLAND - MARCH 12: Amal Clooney and George Clooney attend a dinner to celebrate The Prince's Trust, hosted by Prince Charles, Prince of Wales at Buckingham Palace on March 12, 2019 in London, England. The Prince of Wales, President, The Prince’s Trust Group hosted a dinner for donors, supporters and ambassadors of Prince’s Trust International. (Photo by Chris Jackson - WPA Pool/Getty Images)
NEW YORK, NY - DECEMBER 05: Amal Clooney and George Clooney seen on the streets of Manhattan on December 5, 2018 in New York City. (Photo by James Devaney/GC Images)
HOLLYWOOD, CA - JUNE 07: Actor George Clooney and Amal Clooney arrive at the American Film Institute's 46th Life Achievement Award Gala Tribute to George Clooney on June 7, 2018 in Hollywood, California. (Photo by Axelle/Bauer-Griffin/FilmMagic)
HOLLYWOOD, CA - JUNE 07: Actor George Clooney and Amal Clooney arrive at the American Film Institute's 46th Life Achievement Award Gala Tribute to George Clooney on June 7, 2018 in Hollywood, California. (Photo by Axelle/Bauer-Griffin/FilmMagic)
HOLLYWOOD, CA - JUNE 07: 46th AFI Life Achievement Award Recipient George Clooney (L) and Amal Clooney attend the American Film Institute's 46th Life Achievement Award Gala Tribute to George Clooney at Dolby Theatre on June 7, 2018 in Hollywood, California. 389980 (Photo by Frazer Harrison/Getty Images for Turner)
TOPSHOT - US actor George Clooney (R) and his wife British lawyer Amal Clooney (L) arrive for the wedding ceremony of Britain's Prince Harry, Duke of Sussex and US actress Meghan Markle at St George's Chapel, Windsor Castle, in Windsor, on May 19, 2018. (Photo by Ian West / POOL / AFP) (Photo credit should read IAN WEST/AFP/Getty Images)
WINDSOR, ENGLAND - MAY 19: George Clooney and Amal Clooney attend the wedding of Prince Harry to Ms Meghan Markle at St George's Chapel, Windsor Castle on May 19, 2018 in Windsor, England. Prince Henry Charles Albert David of Wales marries Ms. Meghan Markle in a service at St George's Chapel inside the grounds of Windsor Castle. Among the guests were 2200 members of the public, the royal family and Ms. Markle's Mother Doria Ragland. (Photo by Pool/Samir Hussein/WireImage)
WINDSOR, ENGLAND - MAY 19: George and Amal Clooney in St George's Chapel at Windsor Castle for the wedding of Prince Harry and Meghan Markle on May 19, 2018 in Windsor, England. (Photo by Owen Humphreys - WPA Pool/Getty Images)
NEW YORK, NY - MAY 07: Actor George Clooney and Amal Clooney attends the Heavenly Bodies: Fashion & The Catholic Imagination Costume Institute Gala at The Metropolitan Museum of Art on May 7, 2018 in New York City. (Photo by Noam Galai/Getty Images for New York Magazine)
NEW YORK, NY - MAY 07: George Clooney and Amal Clooney attend the Heavenly Bodies: Fashion & The Catholic Imagination Costume Institute Gala at The Metropolitan Museum of Art on May 7, 2018 in New York City. (Photo by James Devaney/GC Images)
NEW YORK, NY - MAY 07: Met Gala Host Amal Clooney (L) and George Clooney attend Heavenly Bodies: Fashion & The Catholic Imagination Costume Institute Gala at The Metropolitan Museum of Art on May 7, 2018 in New York City. (Photo by Taylor Jewell/Getty Images for Vogue)
NEW YORK, NY - APRIL 06: George Clooney and Amal Clooney go for dinner on April 6, 2018 in New York City. (Photo by Gotham/GC Images)
WASHINGTON, DC - MARCH 24: Amal Clooney and George Clooney attend March For Our Lives on March 24, 2018 in Washington, DC. (Photo by Kevin Mazur/Getty Images for March For Our Lives)
WASHINGTON, DC - MARCH 24: (L-R) John Molner, Katie Couric, George Clooney and Amal Clooney attend March For Our Lives on March 24, 2018 in Washington, DC. (Photo by Kevin Mazur/Getty Images for March For Our Lives)
WESTWOOD, CA - OCTOBER 22: George Clooney, Amal Clooney arrives at the Premiere Of Paramount Pictures' 'Suburbicon' at Regency Village Theatre on October 22, 2017 in Westwood, California. (Photo by Steve Granitz/WireImage)
LOS ANGELES, CA - OCTOBER 22: Executive producer/director George Clooney and his wife Amal Clooney arrive at the premiere of Paramount Pictures' 'Suburbicon' at the Village Theatre on October 22, 2017 in Los Angeles, California. (Photo by Kevin Winter/Getty Images)
VENICE, ITALY - SEPTEMBER 02: George Clooney and Amal Clooney walk the red carpet ahead of the 'Suburbicon' screening during the 74th Venice Film Festival at Sala Grande on September 2, 2017 in Venice, Italy. (Photo by Elisabetta A. Villa/WireImage)
VENICE, ITALY - SEPTEMBER 02: George Clooney and Amal Clooney walk the red carpet ahead of the 'Suburbicon' screening during the 74th Venice Film Festival at Sala Grande on September 2, 2017 in Venice, Italy. (Photo by Venturelli/WireImage)
VENICE, ITALY - SEPTEMBER 02: George Clooney and Amal Clooney are seen leaving Hotel Cipriani during the 74. Venice Film Festival on September 2, 2017 in Venice, Italy. (Photo by Jacopo Raule/GC Images,)
PARIS, FRANCE - FEBRUARY 24: George Clooney and Amal Clooney arrive at the Cesar Film Awards 2017 at Salle Pleyel on February 24, 2017 in Paris, France. (Photo by Fran�is Pauletto/Corbis via Getty Images)
(FILES) File photo dated February 24, 2017 shows US actor George Clooney and his wife British-Lebanese lawyer Amal Clooney as they arrive for the 42nd edition of the Cesar Ceremony at the Salle Pleyel in Paris. The couple welcomed their twin babies, Ella and Alexander, June 6, 2017 in London, the actor's publicist said. The 39-year-old human rights lawyer and 56-year-old Hollywood star -- both first-time parents -- tied the knot in Venice in 2014. / AFP PHOTO / bertrand GUAY (Photo credit should read BERTRAND GUAY/AFP/Getty Images)
PARIS, FRANCE - FEBRUARY 24: George Clooney and Amal Clooney arrive at the Cesar Film Awards Ceremony at Salle Pleyel on February 24, 2017 in Paris, France. (Photo by Rindoff/Charriau/Getty Images)
LONDON, ENGLAND - JANUARY 09: George and Amal Clooney attend the Netflix special screening and reception of The White Helmets hosted by The Clooney Foundation For Justice with George and Amal Clooney, at the Bvlgari Hotel on January 9, 2017 in London, England. (Photo by David M. Benett/Dave Benett/Getty Images for Netflix )
NEW YORK, NY - SEPTEMBER 20: (AFP OUT) Actor George Clooney (L) and wife Amal Clooney attend a Leaders Summit for Refugees during the United Nations 71st session of the General Debate at the United Nations General Assembly on September 20, 2016 in New York, New York. (Photo by Peter Foley - Pool/Getty Images)
CANNES, FRANCE - MAY 12: George Clooney and Amal Clooney attend the 'Money Monster' Premiere during the 69th annual Cannes Film Festival on May 12, 2016 in Cannes, France. (Photo by Tony Barson/FilmMagic)
VATICAN CITY, VATICAN - MAY 29: George Clooney and Amal Clooney attend 'Un Muro o Un Ponte' Seminary held by Pope Francis at the Paul VI Hall on May 29, 2016 in Vatican City, Vatican. (Photo by Franco Origlia/Getty Images)
(FILES) File photo dated February 11, 2016 shows US actor George Clooney (R)and his wife Amal arrive at the 66th Berlinale Film Festival in Berlin. George and Amal Clooney welcomed their twin babies, Ella and Alexander, on June 6, 2017 in London, the actor's publicist Stan Rosenfeld said. The 39-year-old human rights lawyer and 56-year-old Hollywood star -- both first-time parents -- tied the knot in Venice in 2014. / AFP PHOTO / John MACDOUGALL (Photo credit should read JOHN MACDOUGALL/AFP/Getty Images)
WESTWOOD, CA - FEBRUARY 01: Amal Clooney and George Clooney arrive at the premiere of Universal Pictures' 'Hail, Caesar!' at Regency Village Theatre on February 1, 2016 in Westwood, California. (Photo by Gregg DeGuire/WireImage)
WESTWOOD, CA - FEBRUARY 01: George Clooney and Amal Clooney arrives at the Premiere Of Universal Pictures' 'Hail, Caesar!' at Regency Village Theatre on February 1, 2016 in Westwood, California. (Photo by Steve Granitz/WireImage)
Lawyer Amal Alamuddin Clooney and Actor George Clooney arrive at the premiere of 'Our Brand In Crisis' held at the TCL Chinese Theater in Hollywood. (Photo by Frank Trapper/Corbis via Getty Images)
HOLLYWOOD, CA - OCTOBER 26: Amal Clooney and George Clooney attend the premiere of 'Our Brand Is Crisis' at TCL Chinese Theatre on October 26, 2015 in Hollywood, California. (Photo by Jason LaVeris/FilmMagic)
NEW YORK, NY - SEPTEMBER 29: George Clooney (L) and Amal Clooney are seen in Midtown on September 29, 2015 in New York City. (Photo by Michael Stewart/GC Images)
IBIZA, SPAIN - AUGUST 23: (L-R) Michael Meldman, Monica Gambee, Amal Alamuddin, George Clooney, Rande Gerber and Cindy Crawford host the official launch of Casamigos Tequila in Ibiza, at Ushuaia Ibiza Beach hotel on August 23, 2015 in Ibiza, Spain. (Photo by Europa Press/Europa Press via Getty Images)
IBIZA, SPAIN - AUGUST 23: Amal Clooney (L) and Founder of Casamigos Tequila George Clooney attend as Casamigos founders Rande Gerber, George Clooney and Mike Meldman host the official launch of Casamigos Tequila in Ibiza and Spain at Ushuaia Ibiza Beach Hotel on August 23, 2015 in Ibiza, Spain. (Photo by David M. Benett/Dave Benett/Getty Images for Casamigos Tequila)
US movie star George Clooney (R), accompanied by his wife Amal (L), arrives at Haneda airport in Tokyo on May 24, 2015. Clooney is now here for the Japanese premiere of his new film 'Tomorrowland', a retro-futuristic spectacle mixing environmental themes with sci-fi wizardry. AFP PHOTO / Yoshikazu TSUNO (Photo credit should read YOSHIKAZU TSUNO/AFP/Getty Images)
TOKYO, JAPAN - MAY 25: Lawyer Amal Clooney (R) and actor George Clooney (L) attends the Tokyo premiere of 'Tomorrowland' at Roppongi Hills on May 25, 2015 in Tokyo, Japan. (Photo by Atsushi Tomura/Getty Images)
ANAHEIM, CA - MAY 09: (L-R) Mia Alamuddin, actor George Clooney and lawyer Amal Clooney attend the premiere of Disney's 'Tomorrowland' at AMC Downtown Disney 12 Theater on May 9, 2015 in Anaheim, California. (Photo by Alberto E. Rodriguez/Getty Images for Disney)
NEW YORK, NY - MAY 04: Actor George Clooney and lawyer Amal Clooney attend the 'China: Through The Looking Glass' Costume Institute Benefit Gala at the Metropolitan Museum of Art on May 4, 2015 in New York City. (Photo by Axelle/Bauer-Griffin/FilmMagic)
NEW YORK, NY - MAY 02: Amal Clooney and George Clooney are seen on May 2, 2015 in New York City. (Photo by NCP/Star Max/GC Images)
NEW YORK - APRIL 28: Amal Clooney, George Clooney get dinner at Caravaggio in Upper East Side on APRIL 28, 2015 in New York, New York. (Photo by Josiah Kamau/BuzzFoto via Getty Images)
NEW YORK - MARCH 07: George Clooney and Amal Clooney get dinner at Kappo Masa sushi restaurant in Upper East Side seen out in the Big Apple in yellow on MARCH 07, 2015 in New York, New York. (Photo by Josiah Kamau/BuzzFoto via Getty Images)
BEVERLY HILLS, CA - JANUARY 11: Actor George Clooney (L) and Amal Clooney attend the 72nd Annual Golden Globe Awards at The Beverly Hilton Hotel on January 11, 2015 in Beverly Hills, California. (Photo by Jason Merritt/Getty Images)
George and Amal leave Venice town hall Ca'Farsetti after their civil marriage cerimony (Photo by Giulia Candussi/Corbis via Getty Images)
VENICE, ITALY - SEPTEMBER 29: George Clooney and Amal Alamuddin sighted on the way to their civil wedding at Canal Grande on September 29, 2014 in Venice, Italy. (Photo by Robino Salvatore/GC Images)
VENICE, ITALY - SEPTEMBER 28: George Clooney and Amal Alamuddin leave the Aman Hotel on September 28, 2014 in Venice, Italy. George Clooney is set to marry his lawyer fiancee Amal Alamuddin this weekend in Venice where they met. (Photo by PVS/GC Images)
VENICE, ITALY - SEPTEMBER 26: George Clooney and Amal Alamuddin arrive in Venice on September 26, 2014 in Venice, Italy. George Clooney is set to marry his lawyer fiancee Amal Alamuddin this weekend in Venice where they met. (Photo by PVS/GC Images)
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Inside of Buckingham Palace, the couple was photographed sharing a friendly greeting with Prince Charles and posing alongside the other celeb guests for a group photo.

This isn't their first run-in with the royal family: George and Amal attended Prince Harry and Meghan Markle's royal wedding last May, and Amal attended Meghan's lavish New York City baby shower back in February at The Mark Hotel on the Upper East Side.

See photos of from Meghan's baby shower below:

23 PHOTOS
Guests and gifts arrive at Meghan Markle's NYC baby shower
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Guests and gifts arrive at Meghan Markle's NYC baby shower
NEW YORK, NY - FEBRUARY 20: Amal Clooney leaves The Mark Hotel after attending Meghan, Duchess of Sussex's baby shower on February 20, 2019 in New York City. (Photo by James Devaney/GC Images)
NEW YORK, NY - FEBRUARY 20: Amal Clooney leaves The Mark Hotel after attending Meghan, Duchess of Sussex's baby shower on February 20, 2019 in New York City. (Photo by James Devaney/GC Images)
NEW YORK, NY - FEBRUARY 20: Amal Clooney is seen on February 20, 2019 in New York City. (Photo by Jose Perez/Bauer-Griffin/GC Images)
NEW YORK, NY - FEBRUARY 20: Amal Clooney arrives to The Carlyle after attending Meghan, Duchess of Sussex's baby shower on February 20, 2019 in New York City. (Photo by James Devaney/GC Images)
NEW YORK, NY - FEBRUARY 20: Gayle King arrives at Meghan Markle's baby shower on February 20, 2019 in New York City. (Photo by Adrian Edwards/GC Images)
NEW YORK, NY - FEBRUARY 20: Jessica Mulroney is seen arriving at the mark hotel on February 20, 2019 in New York City. (Photo by Raymond Hall/GC Images)
NEW YORK, NY - FEBRUARY 20: Misha Nonoo arrive at Meghan Markle's baby shower on February 20, 2019 in New York City. (Photo by Adrian Edwards/GC Images)
NEW YORK, NY - FEBRUARY 20: Guest arrive at Meghan Markle's baby shower on February 20, 2019 in New York City. (Photo by Adrian Edwards/GC Images)
NEW YORK, NY - FEBRUARY 20: Abigail Spencer arrives at Meghan Markle's baby shower on February 20, 2019 in New York City. (Photo by Adrian Edwards/GC Images)
NEW YORK, NY - FEBRUARY 20: Gifts arrive at Meghan Markle's baby shower on February 20, 2019 in New York City. (Photo by Adrian Edwards/GC Images)
NEW YORK, NY - FEBRUARY 20: Gifts carried by Amal Clooney's security arrive at Meghan Markle's baby shower on February 20, 2019 in New York City. (Photo by Adrian Edwards/GC Images)
NEW YORK, NY - FEBRUARY 20: Amal Clooney is seen arriving at The Mark Hotel on February 20, 2019 in New York City. (Photo by Raymond Hall/GC Images)
New York police officers and members of the press stand outside The Mark Hotel during Meghan, Duchess of Sussex's baby shower on February 20, 2019 in New York City. (Photo by Angela Weiss / AFP) (Photo credit should read ANGELA WEISS/AFP/Getty Images)
Gayle King arrives for the baby shower for Meghan, Duchess of Sussex, at The Mark Hotel Wednesday, Feb. 20, 2019, in New York. (AP Photo/Kevin Hagen).
NEW YORK, NY - FEBRUARY 20:Gayle King is seen arriving at the mark hotel on February 20, 2019 in New York City. (Photo by Raymond Hall/GC Images)
NEW YORK, NY - FEBRUARY 20: Gayle King arrives to The Mark Hotel for Meghan, Duchess of Sussex's baby shower on February 20, 2019 in New York City. (Photo by James Devaney/GC Images)
NEW YORK, NEW YORK - FEBRUARY 19: A general view of atmosphere outside Meghan, Duchess of Sussex baby shower at The Mark Hotel in the Upper East Side on February 19, 2019 in New York City. (Photo by Gotham/GC Images)
Jessica Mulroney arrives for the baby shower for Meghan, Duchess of Sussex, at the Mark Hotel Wednesday, Feb. 20, 2019, in New York. (AP Photo/Kevin Hagen).
NEW YORK, NY - FEBRUARY 20: Amal Clooney is seen arriving at The Mark Hotel on February 20, 2019 in New York City. (Photo by Raymond Hall/GC Images)
Jessica Mulroney arrives for the baby shower for Meghan, Duchess of Sussex, at the Mark Hotel Wednesday, Feb. 20, 2019, in New York. (AP Photo/Kevin Hagen).
NEW YORK, NY - FEBRUARY 20: Jessica Mulroney arrives to The Mark Hotel for Meghan, Duchess of Sussex's baby shower on February 20, 2019 in New York City. (Photo by James Devaney/GC Images)
NEW YORK, NY - February 20: Guest arrives at Meghan Duchess of Sussex Baby Shower at The Mark in New York City n February 20 , 2019. Credit: RW/MediaPunch /IPX
NEW YORK, NY - February 20: Guest arrives at Meghan Duchess of Sussex Baby Shower at The Mark in New York City n February 20 , 2019. Credit: RW/MediaPunch /IPX
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