The 21-year-old 'Shine Ya Light' singer wore a white leather motorcycle suit which became unzipped during her energetic routine on stage.
Ora took to her Twitter page later to apologise for the mishap, tweeting:
"Yes. It's true. I got straight off a motorbike from O2 to Wembley, I didn't have time to change. I didn't have time to change and then all of a sudden the zip got lower and lower, I rushed on stage and pop! It happened, f**k!"
She added: "Sorry guys (How embarrassing). Apologised! Despite that amazing show! :) LOL"
Made in Chelsea's Oliver Proudlock and Spencer Matthews attended the sound battle hosted by Tim Westwood and Gemma Cairney.
Celebrities suffering wardrobe malfunctions - picture gallery: