In London's Hammersmith Apollo, the Duchess of Cornwall and Prince Charles of Wales were the people of the event at this 2016's "Royal Variety Performance" hosted by comedian, David Walliams.

Lady Gaga were among the stars lined up along with Robbie Williams to have the honor to greet Prince Charles and his wife Camilla Parker Bowles. Upon their encounter, Camilla said to the "Joanne" singer that they share the same nickname. "My grandchildren call me Gaga," the Duchess of Cornwall said, according to The Sun.

The Duchess of Cornwall walked the red carpet while she oozed with elegance and royalty donned in her red lace gown, matching diamond accessories, a black clutch bag and a red wrap for the December chill. Prince Charles of Wales came wearing a smart dashing black tuxedo adorned with black and white pockets.

Choosing an appropriate dress for the Royal Variety show, Lady Gaga looked stunning and astonishing as well. Per Daily Mail, she preferred to hide her ink tattoos and replaced it with an elegant Brandon Maxwell halter-neck dress with silky pleats and bow detail at the back. She also wore her golden hair in an updo with pink lipstick to pair up with her pink elegant gown.

She delivered a performance to the Duke and Duchess of Cornwall with a rendition of the hit from her "Joanne" album, "A Million Reasons."

Besides Lady Gaga and Robbie Williams, acts at the event include Sting, Emeli Sande, Gary Barlow, Barry Gibb, Sheridan Smith, Joe Jonas new band DNCE, Diversity, Tom Fletcher, Glee's Amber Riley, Joe Lycett, Alan Davies, Rob Beckett and this year's "Britain's Got Talent" winner, magician Richard Jones.

"Royal Variety Performance" had always been there for the Royal Variety Charity, which supports those who have worked in the entertainment industry and are in need of help due to illness, old age or financial hardship. The show was established in 1912, making it the longest-running entertainment show in the world.

"Royal Variety Performance" 2016 will be broadcast on ITV next Tuesday, Dec. 13.