Comic Michael McIntyre said he wants to lose weight before he appears as a judge on Britain's Got Talent because he is worried about "looking enormous".
The star will join David Hasselhoff and Amanda Holden on the new series of the ITV1 talent show.
He told Chris Evans on his Radio 2 show that getting the job had been "a bit of a whirlwind".
He said: "I have to lose weight because I keep imagining myself in that line up, when they have the live shows on Britain's Got Talent and announce the judges. I don't want me to be standing there, looking enormous, not being able to do up my jacket, which is the situation I'm in now. I want to look svelte."
Simon Cowell will also return to the show, hosted by Ant and Dec, as a judge during the live stage of the competition.
McIntyre told Evans he met Cowell to talk about the role, adding: "It
was like judges' houses on the X Factor, that's how it felt. I kept telling myself I was going for a chat but when he was in front of me I couldn't help but feel I was auditioning."
Around 15 million viewers watched the final of this year's series which was won by gymnastic troupe Spelbound.