Chris Moyles has recorded a track with chart stars Rizzle Kicks.
The outgoing Radio 1 breakfast host told listeners he had joined the band in the studio to create the knockabout track in which they exchange banter, poking fun at each other's ages.
The Mama Do The Hump hitmakers were also guests on his show today as DJ Chris hosted his penultimate breakfast slot in front of 200-plus listeners at the BBC's Radio Theatre.
Chris, 38, was welcoming a series of special guests on the show and his team presented a series of video montages looking back at his period of more than eight years in charge of the prestige morning show.
Talking about his track with duo Rizzle Kicks, he said it was supposed to feature a series of joking insults which they traded about their relative ages. But he said he struggled to think of any appropriate put-downs for the pair who are both 20 years old.
Other guests on the show included Ant and Dec, who hosted a spoof edition of This Is Your Life.
Among the famous figures and past guests from his stint on the show - the longest ever for a Radio 1 breakfast host - was his predecessor Sara Cox. She told him: "When I got fired, I wouldn't want anyone else to take over but Chris. In all seriousness, it was hard at first. But I've gone from a begrudging fan to a massive fan to a friend."
Channel 4's Million Pound Drop Live presenter Davina McCall, a long-time friend, said: I'd like to think I'm your number one celebrity fan."
Gary Barlow, one of his fellow trekkers during a Comic Relief challenge to climb Kilimanjaro, also attended the live show. And Cheryl Cole - another of the stars from that trip - also sent a message of support.
Chris will bow out from the show for a final time tomorrow. Fellow Radio 1 DJ Nick Grimshaw is to take over the programme later this month.