judges , 38, and , 73, have been within the UK this weekend to carry out throughout the Coronation live performance.
As Sunday's present aired, Katy and Lionel just about appeared on the ABC present to examine in with host Ryan Seacrest, 48.
Nevertheless, followers had been in for a shock, when Lionel shocked viewers with a go to from the newly-appointed royals.
Lionel wowed in an all-black outfit together with an embellished sequin jacket, whereas Katy rocked a strapless inexperienced robe with a big pearl necklace.
Katy started: "It was unbelievable and we're right here for the coronation live performance at Windsor Citadel."
:
Lionel continued: "Now we are attempting to determine what we are able to do to convey one thing completely different to the present. So, ...I've a shock."
Followers at residence had been left in shock as and joined the judges, with Katy bowing at their entrance.
King Charles quipped: "I simply needed to examine how lengthy you'll be utilizing this room."
Lionel continued: "We now have to surrender the room straight away."
He thanked Charles and Camilla for his or her hospitality earlier than the King remarked: "No, thanks in your good efficiency and Katy as nicely. It actually was."
DON'T MISS [COMMENT]
Katy then requested Camilla: "Are we making an excessive amount of noise?"
"I perceive there's a social gathering, " Lionel replied as King Charles added: "Ah you might have heard about that."
The Pop Idol star continued: "Properly, you're throwing a celebration subsequent door."
The King concluded: "Ah, that is proper. Had we higher take you to the social gathering however you are busy with all these different issues.
Lionel then informed the royals he "beloved them" earlier than congratulating them and so they walked off digicam.
American Idol host Ryan added: "That's the royal remedy. I discovered myself standing up straighter whereas I used to be watching that proper there."
Many followers rushed to to touch upon the shock look from the English royals.
@Lucinda_pino mentioned: "I used to be gobsmacked! For a second, I assumed they had been royal impersonators!
"That was cool, King Charles asking when will they be performed with the room was the perfect!!!"
@Farchie03 added: "LOVE THIS. Fabulous celebration and respect by Katy and Lionel! Thanks in your spectacular performances and assist of The King, Queen and Coronation.
"Windsor, thanks. Windsor loves you. Please go to us once more. Take a bow!"
@DancingInfinit1 commented: "#KingCharleslll showing on American Idol was not on my bingo card, however I'm right here for it!!!! Sooooo enjoyable and funky #CoronationConcert."
Alanis Morissette and Ed Sheeran stuffed in as judges for Katy and Lionel because the pair celebrated the coronation within the UK.