It marked the first time Charles attended the annual Royal Variety Performance as patron of the Royal Variety Charity, which helps members of the entertainment industry in the UK who need help and assistance.
The monarch, 76, looked smart dressed in a black tuxedofor the outing. The royal kept warm on the chilly November evening with a black coat.
King Charles III arrives at the Royal Variety Performance at Royal Albert Hall
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The King was treated to performances by Sophie Ellis-Bextor and James Bay, with Sir Elton John and his husband David Furnish presenting a musical number from their new show The Devil Wears Prada with star Vanessa Williams and its cast.
The event was hosted by comedian Alan Carr and TV presenter Amanda Holden, with Alan saying he was "completely thrilled" to be on duty ahead of the night.
Charles attended without Camilla
Charles also saw magic from Penn and Teller and Stephen Mulhern, along with a performance from Cirque Du Soleil and the English National Ballet.
There was also an exclusive medley from Sir Cameron Mackintosh's production of the musical Oliver! and a performance from the company of Andrew Lloyd Webber's Starlight Express.
Britain's King Charles III (L) attends the Royal Variety Performance
Money raised from the show will go to help people from the world of entertainment in need of care and assistance, with the Royal Variety Charity launching an initiative to help those with mental health issues this year.
The show will air on ITV1, ITVX, STV and STV Player in December.
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National anthem
King Charles III stands with Giles Cooper, chair of the Royal Variety Charity, as the national anthem is played
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The King and Elton
During his time at the show, the King met Sir Elton John alongside his husband David Furnish.
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West End stars
King Charles met the young performers of the West End's Oliver!
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A programme for the King
The King told 10-year-old Louie Cooper he was "very well organised" when the youngster handed him a programme.
The monarch also accepted a bouquet of flowers from eight-year-old Iris King-Taylor, that was originally intended for the Queen.
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Amanda Holden
Show host Amanda Holden looked dazzling at the event, wearing a striking bejewelled green crop top. She finished her look off with a mint green skirt.
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Alan Carr
Alan co-hosted alongside Amanda and the comedian looked the part in a black tuxedo. And we love the unique lizard brooch!
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Lorraine Kelly
Queen of Daytime TV Lorraine looked wonderful in a pink sequin jacket and a shirt saying: 'Love is all around'.
Lorraine is performing at the event in the Change And Check Choir, a choir made up of women who detected breast cancer thanks to the TV presenter.
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Sophie Ellis-Bextor
Sophie Ellis-Bexter looked absolutely gorgeous at the event in a stylish black dress.
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Penn and Teller
Penn and Teller rocked tweed suits ahead of their magical performance at the event.
LISTEN: Inside Camilla's big TV moment
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