James Corden has admitted the pressure of taking over the reins of The Late Late Show left him wanting to quit before filming even began.
He has found worldwide success through the US chat show, and his segment Carpool Karaoke has seen the likes of Adele, Coldplay and even First Lady Michelle Obama join him on the show.
The viral sensation has been picked up by Apple Music for its own TV show, while another spin-off, Drop The Mic - in which celebrities rap insults at each other - has been snapped up for a series next year.
Yet James said two weeks before launch, he got cold feet.
"I remember saying to Ben, who's my best friend and the executive producer of our show, 'If I could just give the money back now and walk away, I would'," he was quoted as saying in The Mirror.
Speaking to John Bishop on his upcoming show In Conversation with..., the Gavin And Stacey star revealed that initially no celebrities were on board with his karaoke idea, which he admitted was a "ridiculous pitch".
He said: "We thought everyone's going to want to do this, and no-one did... We never thought it would become this monster."
Now, Britney Spears is the latest singer to hop into the passenger seat of James's Range Rover.
He added that he made the decision to take the job in the US because he hated being away from his wife Julia and children Max, five, and Carey, one, while filming.
"Here's a job where however hard I work in the day,... if my son wakes up in the night and has a nightmare, I'm going to be around," he said.
"I want to be a consistent and present dad and husband. I feel very lucky that I am afforded such a life because so many people aren't."