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Sia has revealed that she refused to give one of her songs to Duffy for the Welsh star's next album.
The singer, who collaborated with Christina Aguilera on her upcoming new record, admitted that she partly regrets turning down the 'Mercy' star.
"Duffy's people were really, really trying to get a song to put out as a single but I kept thinking I didn't have enough ballads for my next album so I said no," she told the Daily Star.
"Now I hear it among the rest of the songs on my record and it doesn't fit. I should have given it to her. It's a good learning curve as to what an idiot I can be."
Sia, who has previously provided vocals on three Zero 7 albums, is expected to release new solo record We Are Born in 2010.
