Kate Middleton is a knockout in Alexander McQueen on date night with William

It's date night for Duchess Kate and Prince William!

The Duke and Duchess of Cambridge stepped out on Monday night for a very glamorous evening at London's Palladium Theatre for the annual Royal Variety Performance. The yearly event is held in accordance with Queen Elizabeth's patronage the Royal Variety, which the royal family has supported King George V and Queen Marry first attended a performance in 1912. Last year, a newly pregnant Meghan Markle and Prince Harry attended on the queen's behalf, while the Cambridges had attended the year prior. 

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Kate Middleton steps out for Royal Variety Performance
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Kate Middleton steps out for Royal Variety Performance
LONDON, ENGLAND - NOVEMBER 18: Catherine, Duchess of Cambridge attends the Royal Variety Performance at Palladium Theatre on November 18, 2019 in London, England. (Photo by Samir Hussein/WireImage)
LONDON, ENGLAND - NOVEMBER 18: Catherine, Duchess of Cambridge attends the Royal Variety Performance at Palladium Theatre on November 18, 2019 in London, England. (Photo by Samir Hussein/WireImage)
LONDON, ENGLAND - NOVEMBER 18: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge attend the Royal Variety Performance at Palladium Theatre on November 18, 2019 in London, England. (Photo by Samir Hussein/WireImage)
LONDON, ENGLAND - NOVEMBER 18: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge attend the Royal Variety Performance at the Palladium Theatre on November 18, 2019 in London, England. (Photo by John Phillips/Getty Images)
LONDON, ENGLAND - NOVEMBER 18: Catherine, Duchess of Cambridge attends the Royal Variety Performance at Palladium Theatre on November 18, 2019 in London, England. (Photo by Mark Cuthbert/UK Press via Getty Images)
LONDON, ENGLAND - NOVEMBER 18: Catherine, Duchess of Cambridge attends the Royal Variety Performance at Palladium Theatre on November 18, 2019 in London, England. (Photo by Mark Cuthbert/UK Press via Getty Images)
LONDON, ENGLAND - NOVEMBER 18: Catherine, Duchess of Cambridge attends the Royal Variety Performance at Palladium Theatre on November 18, 2019 in London, England. (Photo by Mark Cuthbert/UK Press via Getty Images)
LONDON, ENGLAND - NOVEMBER 18: Catherine, Duchess of Cambridge attends the Royal Variety Performance at Palladium Theatre on November 18, 2019 in London, England. (Photo by Mark Cuthbert/UK Press via Getty Images)
LONDON, ENGLAND - NOVEMBER 18: Catherine, Duchess of Cambridge attends the Royal Variety Performance at Palladium Theatre on November 18, 2019 in London, England. (Photo by Samir Hussein/WireImage)
Britain's Prince William, Duke of Cambridge (2nd L) and Britain's Catherine, Duchess of Cambridge (2nd R) arrive to attend the Royal Variety Performance at the Palladium Theatre in central London on November 18, 2019. (Photo by Geoff Pugh / POOL / AFP) (Photo by GEOFF PUGH/POOL/AFP via Getty Images)
LONDON, ENGLAND - NOVEMBER 18: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge attend the Royal Variety Performance at Palladium Theatre on November 18, 2019 in London, England. (Photo by Geoff Pugh - WPA Pool/Getty Images)
LONDON, ENGLAND - NOVEMBER 18: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge attend the Royal Variety Performance at Palladium Theatre on November 18, 2019 in London, England. (Photo by Geoff Pugh - WPA Pool/Getty Images)
Britain's Prince William, Duke of Cambridge (2nd L) and Britain's Catherine, Duchess of Cambridge (2nd R) stand for the national Anthem in the Royal Box as they attend the Royal Variety Performance at the Palladium Theatre in central London on November 18, 2019. (Photo by Geoff Pugh / POOL / AFP) (Photo by GEOFF PUGH/POOL/AFP via Getty Images)
LONDON, ENGLAND - NOVEMBER 18: Catherine, Duchess of Cambridge attends the Royal Variety Performance at Palladium Theatre on November 18, 2019 in London, England. (Photo by Samir Hussein/WireImage)
Britain's Prince William, Duke of Cambridge (2nd L) and Britain's Catherine, Duchess of Cambridge (R) arrive to attend the Royal Variety Performance at the Palladium Theatre in central London on November 18, 2019. (Photo by Geoff Pugh / POOL / AFP) (Photo by GEOFF PUGH/POOL/AFP via Getty Images)
LONDON, ENGLAND - NOVEMBER 18: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge attend the Royal Variety Performance at the London Palladium on November 18, 2019 in London, England. (Photo by Karwai Tang/WireImage)
LONDON, ENGLAND - NOVEMBER 18: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge attend the Royal Variety Performance at the London Palladium on November 18, 2019 in London, England. (Photo by Karwai Tang/WireImage)
LONDON, ENGLAND - NOVEMBER 18: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge attend the Royal Variety Performance at the London Palladium on November 18, 2019 in London, England. (Photo by Karwai Tang/WireImage)
LONDON, ENGLAND - NOVEMBER 18: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge attend the Royal Variety Performance at the Palladium Theatre on November 18, 2019 in London, England. (Photo by John Phillips/Getty Images)
LONDON, ENGLAND - NOVEMBER 18: Catherine, Duchess of Cambridge attends the Royal Variety Performance with Prince William, Duke of Cambridge at the Palladium Theatre on November 18, 2019 in London, England. (Photo by John Phillips/Getty Images)
LONDON, ENGLAND - NOVEMBER 18: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge attend the Royal Variety Performance at the London Palladium on November 18, 2019 in London, England. (Photo by Karwai Tang/WireImage)
LONDON, ENGLAND - NOVEMBER 18: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge attend the Royal Variety Performance at the London Palladium on November 18, 2019 in London, England. (Photo by Karwai Tang/WireImage)
LONDON, ENGLAND - NOVEMBER 18: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge attend the Royal Variety Performance at the London Palladium on November 18, 2019 in London, England. (Photo by Karwai Tang/WireImage)
LONDON, ENGLAND - NOVEMBER 18: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge attend the Royal Variety Performance at the London Palladium on November 18, 2019 in London, England. (Photo by Karwai Tang/WireImage)
LONDON, ENGLAND - NOVEMBER 18: Catherine, Duchess of Cambridge attends the Royal Variety Performance with Prince William, Duke of Cambridge at the London Palladium on November 18, 2019 in London, England. (Photo by Karwai Tang/WireImage)
LONDON, ENGLAND - NOVEMBER 18: Catherine, Duchess of Cambridge attends the Royal Variety Performance with Prince William, Duke of Cambridge at the London Palladium on November 18, 2019 in London, England. (Photo by Karwai Tang/WireImage)
LONDON, ENGLAND - NOVEMBER 18: Catherine, Duchess of Cambridge meets the cast of Mary Poppins including Petula Clark (in the beige hat) as she attends the Royal Variety Performance at Palladium Theatre on November 18, 2019 in London, England. (Photo by Geoff Pugh - WPA Pool/Getty Images)
LONDON, ENGLAND - NOVEMBER 18: Catherine, Duchess of Cambridge meets the cast of Mary Poppins including Petula Clark (in the beige hat) as she attends the Royal Variety Performance at Palladium Theatre on November 18, 2019 in London, England. (Photo by Geoff Pugh - WPA Pool/Getty Images)
LONDON, ENGLAND - NOVEMBER 18: Catherine, Duchess of Cambridge meets guests as she attends the Royal Variety Performance at Palladium Theatre on November 18, 2019 in London, England. (Photo by Geoff Pugh - WPA Pool/Getty Images)
Britain's Prince William, Duke of Cambridge (2nd L) and Britain's Catherine, Duchess of Cambridge (2nd R) sing the national Anthem in the Royal Box as they attend the Royal Variety Performance at the Palladium Theatre in central London on November 18, 2019. (Photo by Geoff Pugh / POOL / AFP) (Photo by GEOFF PUGH/POOL/AFP via Getty Images)
Britain's Catherine, Duchess of Cambridge (R), speaks to the cast of Mary Poppins including Petula Clark (L) in the beige hat as she arrives to attend the Royal Variety Performance at the Palladium Theatre in central London on November 18, 2019. (Photo by Geoff Pugh / POOL / AFP) (Photo by GEOFF PUGH/POOL/AFP via Getty Images)
Britain's Catherine, Duchess of Cambridge speaks to guests as she arrives to attend the Royal Variety Performance at the Palladium Theatre in central London on November 18, 2019. (Photo by Geoff Pugh / POOL / AFP) (Photo by GEOFF PUGH/POOL/AFP via Getty Images)
LONDON, ENGLAND - NOVEMBER 18: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge attend the Royal Variety Performance at the Palladium Theatre on November 18, 2019 in London, England. (Photo by John Phillips/Getty Images)
LONDON, ENGLAND - NOVEMBER 18: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge attend the Royal Variety Performance at Palladium Theatre on November 18, 2019 in London, England. (Photo by Karwai Tang/WireImage)
LONDON, ENGLAND - NOVEMBER 18: Catherine, Duchess of Cambridge attends the Royal Variety Performance with Prince William, Duke of Cambridge at Palladium Theatre on November 18, 2019 in London, England. (Photo by Karwai Tang/WireImage)
LONDON, ENGLAND - NOVEMBER 18: Catherine, Duchess of Cambridge attends the Royal Variety Performance with Prince William, Duke of Cambridge at Palladium Theatre on November 18, 2019 in London, England. (Photo by Karwai Tang/WireImage)
LONDON, ENGLAND - NOVEMBER 18: Catherine, Duchess of Cambridge attends the Royal Variety Performance at Palladium Theatre on November 18, 2019 in London, England. (Photo by Samir Hussein/WireImage)
LONDON, ENGLAND - NOVEMBER 18: Catherine, Duchess of Cambridge attends the Royal Variety Performance at Palladium Theatre on November 18, 2019 in London, England. (Photo by Samir Hussein/WireImage)
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The parents-of-three opted for their black-tie best for the occasion, with Prince William looking dapper in a simple black tuxedo.

However, it was Kate's glamorous Alexander McQueen gown that truly stole the show. With its sheer lace and fitted bodice, the long-sleeved creation was a bolder look for the duchess, who normally opts for monochromatic styles and simple silhouettes. The duchess accessorized the look with Erdem earrings, and black stilettos and a black clutch, both believed to be by Jimmy Choo (you can shop the royal's heels here).

The fundraiser, which helps raise money to help hundreds of entertainers throughout the UK who are in need of aid, whether due to health issues or old age, was met with a variety of musical theater performances, including from the show "Marry Poppins" and "Come From Away." 

"I love Mary Poppins!" the duke was overheard revealing while meeting the show's cast members before the performance. 

For more on Will and Kate's date night, watch the video above.

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Duchess Meghan and Prince Harry at Royal Variety Performance 2018
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Duchess Meghan and Prince Harry at Royal Variety Performance 2018
LONDON, ENGLAND - NOVEMBER 19: Meghan, Duchess of Sussex and Prince Harry, Duke of Sussex arrive at The Royal Variety Performance 2018 at London Palladium on November 19, 2018 in London, England. (Photo by Samir Hussein/WireImage)
LONDON, ENGLAND - NOVEMBER 19: Meghan, Duchess of Sussex and Prince Harry, Duke of Sussex arrive at The Royal Variety Performance 2018 at London Palladium on November 19, 2018 in London, England. (Photo by Samir Hussein/WireImage)
LONDON, ENGLAND - NOVEMBER 19: Meghan, Duchess of Sussex arrives at The Royal Variety Performance 2018 at London Palladium on November 19, 2018 in London, England. (Photo by Samir Hussein/WireImage)
LONDON, ENGLAND - NOVEMBER 19: Meghan, Duchess of Sussex arrives at The Royal Variety Performance 2018 at London Palladium on November 19, 2018 in London, England. (Photo by Samir Hussein/WireImage)
LONDON, ENGLAND - NOVEMBER 19: Meghan, Duchess of Sussex arrives at The Royal Variety Performance 2018 at London Palladium on November 19, 2018 in London, England. (Photo by Samir Hussein/WireImage)
Meghan (L), Duchess of Sussex, meets members of British band Take That, Gary Barlow (3R), Howard Donald (2R) and Mark Owen as she attends the annual Royal Variety Performance at the Palladium Theatre in central London on November 19, 2018. (Photo by Ian Vogler / various sources / AFP) (Photo credit should read IAN VOGLER/AFP/Getty Images)
Meghan, Duchess of Sussex (L) greets British singer-songwriter Gary Barlow, as she attends the annual Royal Variety Performance at the Palladium Theatre in central London on November 19, 2018. (Photo by Ian Vogler / various sources / AFP) (Photo credit should read IAN VOGLER/AFP/Getty Images)
Meghan, Duchess of Sussex, attends the annual Royal Variety Performance at the Palladium Theatre in central London on November 19, 2018. (Photo by Ian Vogler / POOL / AFP) (Photo credit should read IAN VOGLER/AFP/Getty Images)
Britain's Prince Harry (2L), Duke of Sussex, and his wife Meghan (2R), Duchess of Sussex, attend the annual Royal Variety Performance at the Palladium Theatre in central London on November 19, 2018. (Photo by Ian Vogler / POOL / AFP) (Photo credit should read IAN VOGLER/AFP/Getty Images)
LONDON, ENGLAND - NOVEMBER 19: Meghan, Duchess of Sussex and Prince Harry, Duke of Sussex attend The Royal Variety Performance 2018 at London Palladium on November 19, 2018 in London, England. (Photo by WPA Pool/Getty Images)
LONDON, UNITED KINGDOM - NOVEMBER 19 : (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 24 HOURS AFTER CREATE DATE AND TIME) Meghan, Duchess of Sussex attends The Royal Variety Performance 2018 at the London Palladium on November 19, 2018 in London, England. (Photo by Max Mumby/Indigo/Getty Images)
LONDON, UNITED KINGDOM - NOVEMBER 19 : (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 24 HOURS AFTER CREATE DATE AND TIME) Meghan, Duchess of Sussex attends The Royal Variety Performance 2018 at the London Palladium on November 19, 2018 in London, England. (Photo by Max Mumby/Indigo/Getty Images)
LONDON, UNITED KINGDOM - NOVEMBER 19 : (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 24 HOURS AFTER CREATE DATE AND TIME) Meghan, Duchess of Sussex and Prince Harry, Duke of Sussex attend The Royal Variety Performance 2018 at the London Palladium on November 19, 2018 in London, England. (Photo by Max Mumby/Indigo/Getty Images)
LONDON, UNITED KINGDOM - NOVEMBER 19 : (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 24 HOURS AFTER CREATE DATE AND TIME) Meghan, Duchess of Sussex and Prince Harry, Duke of Sussex attend The Royal Variety Performance 2018 at the London Palladium on November 19, 2018 in London, England. (Photo by Max Mumby/Indigo/Getty Images)
LONDON, ENGLAND - NOVEMBER 19: Meghan, Duchess of Sussex attends The Royal Variety Performance 2018 at London Palladium on November 19, 2018 in London, England. (Photo by Samir Hussein/WireImage)
LONDON, ENGLAND - NOVEMBER 19: Prince Harry, Duke of Sussex and Meghan, Duchess of Sussex depart after attending the Royal Variety Performance 2018 at London Palladium on November 19, 2018 in London, England. (Photo by Karwai Tang/WireImage)
LONDON, ENGLAND - NOVEMBER 19: Prince Harry, Duke of Sussex and Meghan, Duchess of Sussex depart after attending the Royal Variety Performance 2018 at London Palladium on November 19, 2018 in London, England. (Photo by Karwai Tang/WireImage)
LONDON, ENGLAND - NOVEMBER 19: Meghan, Duchess of Sussex departs after attending the Royal Variety Performance 2018 at London Palladium on November 19, 2018 in London, England. (Photo by Karwai Tang/WireImage)
LONDON, ENGLAND - NOVEMBER 19: Prince Harry, Duke of Sussex, Meghan, Duchess of Sussex and Comedian Greg Davies attend The Royal Variety Performance 2018 at London Palladium on November 19, 2018 in London, England. (Photo by Ian Vogler - WPA Pool/Getty Images)
LONDON, ENGLAND - NOVEMBER 19: Meghan, Duchess of Sussex meets Comedian Jimmy Tarbuck after The Royal Variety Performance 2018 at London Palladium on November 19, 2018 in London, England. (Photo by Ian Vogler - WPA Pool/Getty Images)
LONDON, ENGLAND - NOVEMBER 19: Meghan, Duchess of Sussex greets Andrea Bocelli at The Royal Variety Performance 2018 at London Palladium on November 19, 2018 in London, England. (Photo by Ian Vogler - WPA Pool/Getty Images)
LONDON, ENGLAND - NOVEMBER 19: Prince Harry, Duke of Sussex and Meghan, Duchess of Sussex meet the cast of "Circus 1903" at The Royal Variety Performance 2018 at London Palladium on November 19, 2018 in London, England. (Photo by Ian Vogler - WPA Pool/Getty Images)
LONDON, ENGLAND - NOVEMBER 19: Prince Harry, Duke of Sussex and Meghan, Duchess of Sussex leave The Royal Variety Performance 2018 at London Palladium on November 19, 2018 in London, England. (Photo by Mark Cuthbert/UK Press via Getty Images)
Meghan (L), Duchess of Sussex, meets members of British band Take That, Gary Barlow (3R), Howard Donald (2R) and Mark Owen as she attends the annual Royal Variety Performance at the Palladium Theatre in central London on November 19, 2018. (Photo by Ian Vogler / various sources / AFP) (Photo credit should read IAN VOGLER/AFP via Getty Images)
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