The Sun have this article about it today:
Nothing duff about T4 Duffy
By GEMMA VARLEY
And DUFFY's day was nearly ruined when she arrived to perform – and was presented with Adele's wardrobe.
Adele had pulled out so Duffy was given her dressing room – and panicked she’d been given the wrong outfit.
The problem was soon fixed and Duffy looked great.
More pics below from the T4 website.