The This Morning duo kicked off Wednesday’s show with a performance of I’m Still Standing by Sir Elton – but the singer was actually Paul Bacon, “the ultimate Elton John act”.
Sir Elton’s doppelganger Mr Bacon performed the 1983 hit at a grand piano outside the studios, complete with the singer’s round sunglasses and a large earring.
“Thanks Elton John – amazing,” Willoughby joked before revealing Mr Bacon’s identity. “The eagle-eyed among you might have noticed that up close our Rocketman might not look exactly like the real Elton John. He is in fact Paul Bacon, otherwise known as the ultimate Elton John act.
Schofield struggled to compose himself at the swarm of people crowded around Mr Bacon, believing it to be Sir Elton.
“A number of people have been fooled,” he said. “The entire residence of Soho House were out on the balcony looking out. The Good Morning Britain offices have just emptied and come out to watch who they think is Elton John.
“Davina [McCall] thought it was Elton. We fooled the whole of Television Centre with Paul Bacon.”
Mr Bacon later returned to perform Rocket Man, with fewer onlookers.
His appearance on the show was to mark the release of Sir Elton biopic Rocketman which sees Taron Egerton play the legendary singer.
Egerton joined Sir Elton at the London premiere on Monday night, days after a special screening at the Cannes Film Festival.
Bodyguard star Madden - who plays Sir Elton's manager John Reid - was also in attendance with Bryce Dallas Howard, who plays Sir Elton's late mother.
This Morning is on ITV, weekdays at 10:30am