Published Monday, 10 December 2012
The Love Machine hitmakers have been off the road for three years and blame their lengthy hiatus from touring for their rehearsal blunders.
The girlband performed during the Capital Radio Jingle Bell Ball at the O2 Arena in London on Sunday, but they needed a little extra help to make sure the show went smoothly.
Band member Cheryl Cole told The Sun: "In rehearsals I was singing Kimberley's (Walsh) lines and she was like 'Cheryl, you don't sing that,' and I was like, 'I'm sorry'.
"We needed lyric sheets for every single song - it was so funny."