The X Factor star referred to the band in the past tense when discussing her music on Danish TV.
'The previous three tracks were with a girl group I was with for seven years,' she said.
'So to be number one solo was crazy, like the best feeling in the world.'
But a Girls Aloud spokesman insists Cheryl, 26, hasn't quit.
'Cheryl is still a member of Girls Aloud,' he said.
'She was just putting her solo number one into context for an audience that would not be aware of Girls Aloud.'
Where to next?
- Cheryl's rise to fame
- Cheryl and Ashley's relationship
- Celebrities smoking pics!