The 63-year-old let the word slip during a conversation about his home life on today's show.
John said he hardly ever plays the piano at his house these days, which Chris responded to by saying Jools Holland is unable to get on with his day without playing the instrument.
Elton then said: 'Oh f****** hell!'
The Rocket Man then quickly realised what he had said and apologised to Chris.
After the 9 o'clock news, the singer apologised by saying: 'I'm really, really sorry that I said that naughty word, but I cannot believe that anyone would want to get up and first thing in the morning play the piano.'
Chris then played his tune Sorry Seems To Be The Hardest Word.