DJ Nick Grimshaw rapped on stage with new X-Factor presenter Olly Murs on the second day of Europe's biggest free music festival.
The tongue in cheek performance helped lift the crowd who were drenched from the rain at Radio 1's Big Weekend event in Norwich.
Murs will front the next series of the X-Factor and it is rumoured that Grimshaw may be joining him.
In an interview at the festival yesterday, he told the Star on Sunday he would not take up any offer from Simon Cowell if it threatened his Radio 1 career.
But he did not rule out a judging slot, adding: "I would love to do it. I think it is really fun and I love watching it."
Earlier the breakfast show host tweeted to reveal he had been transported to the Earlham Park venue in a minicab sponsored by pop star Taylor Swift.
The American singer has decorated two taxis in the city with pictures of herself for the event - and promised some fans will get their ride paid for.
Singer songwriter George Ezra will perform before Swift on the main stage tonight. The festival favourite said he was happy to be part of such an eclectic line-up.
Describing Big Weekend as the start of the UK festival season, he said he still looked forward to such events - but had given up camping.
He told the Press Association: "This is probably the only place you will see me and Taylor Swift on the same stage and I think that's brilliant.
"For me festivals aren't about the line-up but the atmosphere and an event like this is really accessible and attracts all kinds of people.
"I went to my first festival at Reading when I was 16 and this may be what introduces many people to festivals.
"I still really enjoy festivals - I feel at home and they're a fun place to exist - like a kind of fictional world.
"To be honest though, I don't camp any more. I did camp at one last year but woke up thinking 'what a silly idea, I've got to go out and perform now'."
The free music event opened yesterday with performances from Florence And The Machine, Muse and Snoop Dog, who wore a Norwich City football shirt for the occasion.
Swift and Foo Fighters will close the event tonight.
A total of 50,000 people are expected to attend over the course of the weekend.
Presenter Greg James studied at the University of East Anglia (UEA) which sits next to the park where they event is taking place.
He said his Norwich links meant his friends often compared him to comedy DJ Alan Partridge.
He said: "I am a massive fan of Steve Coogan and, in a weird way, he was one of my inspirations for getting into radio.
"But I do worry I'm turning into him and sometimes I have to stop myself."
He admitted many of the Radio 1 DJs were a little worse for wear after a big night. But he said Grimshaw had largely abstained from alcohol in preparation for his rap performance.
"I think it was a very accomplished rap," he added.
"He did look a bit strange, though. I think he was going for rapper but ended up looking like a slightly odd tennis player."
The UEA has recently awarded James with a doctorate in recognition of his success and he said he intended to make the most of the new title.
"Apparently it gets you into places and gets you upgrades on planes and stuff," he added.
"I'm going to change my driving licence, passport and all my other documents.
"My only worry is if I'm on a plane and something goes wrong I may be asked to come to the rescue. But fortunately I'm a doctor of letters and not of medicine."
He added that one of the highlights of his weekend was seeing Snoop Dogg taking photographs of wildlife.
"There is a maze area backstage and he was just wondering around taking pictures of flowers, which I thought was brilliant."
P3 Swift played to a packed arena as the sun went down before Foo Fighters closed the event.
Lead singer Dave Grohl admitted the Shake It Off singer was his guilty pleasure as he dedicated the song Congregation to her.
He said: "I'm officially obsessed, she might want to get a restraining order."