America’s Got Talent judge Piers Morgan was left exhausted after Mariah Carey’s guest appearance on the show – because the singer forced production staff to work around the clock to make sure her “three-minute” appearance was perfect.

Earlier this month, the pop superstar appeared on stage during an episode of the hit TV show, which is hosted by her husband Nick Cannon, to belt out her new single ‘Obsessed.’

Carey wowed the judging panel – which also includes David Hasselhoff and Sharon Osbourne – with her pre-recorded performance.

But Morgan admits the spectacular rendition came at a price, because Carey had to make sure every tiny detail was perfect before she would let TV bosses air the footage.

“She’s such a perfectionist. We were all in the studio until nearly midnight as she planned her three-minute appearance, right down to the detail of the lighting, sound and camera angles. And work with producers in the editing suite apparently continued to 6 a.m. until she was absolutely happy. Mariah has the reputation of a diva. But like most divas – from Piaf to Whitney Houston to Madonna – that’s primarily because she’ll do whatever it takes, however long it takes, to get things as good as they can be,” said Morgan.

Source, Bauer-Griffin