Talking about her ex-boyfriend, the singer said that their 2009 album Sigh No More was 'their album' and that it influenced her style on her new LP 21.
The 22-year-old told Absolute Radio, 'That Mumford record was me and my ex's album. If it wasn't for that album I don't think I'd be as emotionally drained as I am and not as emotionally exhausted and [would] not [have] been able to write this album.
'So I've got to be a bit thankful really 'cos it's doing really well.'
She added that she would love to team up with the folk rock band. 'I think I've told them that too,' she said.