X Factor Fleur in Ronson apology
X Factor finalist Fleur East has offered an apology to producer Mark Ronson after her performance of one of his songs prompted him to release it weeks ahead of the planned date.
She sang Uptown Funk in Saturday night's semi-final and it went down so well that within hours it was at the top of the iTunes chart.
The success of the tune - before the original had even gone on sale - prompted Ronson's label to rush release the song five weeks early.
East, 26, told Radio 1's Newsbeat: "Yeah, I'm really sorry, but all I can say is it's props to all their creative hard work because it's an amazing song.
"I don't know what they were thinking in their minds. I don't think anyone expected my performance to be as popular as it was. We didn't expect it to go to number one on iTunes. That's crazy like."
She went on: "I think straight away they were like, 'oh wow, what's happened here?'. So they had to speed up the release date."
X Factor boss Simon Cowell praised her version of the song as one of the top three performances in the show's history.
Ronson's version - which features singer Bruno Mars - is being released by a subsidiary of Sony Music, the parent company of Cowell's firm Syco.
Singer Lily Allen has suggested it was carefully stage-managed with a message on Twitter saying: "It is an amazing song and Fleur did it justice but it's still a great example of music industry corruption."
Ronson's version of the song - to be included on his fourth album Uptown Special - is second favourite to take the Christmas number one, according to bookmaker William Hill.
The still-to-be-decided X Factor's winner's single is still favourite at 2/7, but Ronson's track is 5/1, overtaking Band Aid 30.
"Fleur's X Factor performance has pushed this song to the forefront of everyone's mind and there is a very real chance that this song could muscle into the race for Christmas number one," said Hill spokesman Joe Crilly.