The singer, 31, looked sensational in the shimmery number which she paired with glittery heeled mules.
The new series of the ITV show will begin on January 1, with the second episode set to air on January 2.
She had her bright blonde locks swept back into an elegant up do for the snaps which saw her walking towards the camera with her arms in the air.
Rita later posed on a chair in the behind-the-scenes shots, where she placed her hands on her knees and sultrily gazed at the camera.
Her make up looked glamorous and consisted of a huge black winged eyeliner paired with a neutral coloured lip.
The Hot Right Now songstress wore multiple hooped earrings in her lobes, and wore a stunning metal choker round her neck.
Rita Ora is on the panel of judges with Mo Gilligan, Jonathan Ross and Davina McCall.
Speaking to MailOnline, Davina and presenter Joel Dommett revealed someone Rita knows ‘quite personally’ was among the contestants while Davina found it ‘weird’ to see someone she knew, but neither of them correctly guessed their friends identities.
Davina said: ‘What might be a massive name for Mo might not be a massive name for me and vice versa.
‘There’s a big name for me, there’s a big name for Mo. He couldn’t believe it. There was someone I know, that was quite weird.’
Joel added: ‘Someone Rita knows quite personally.’
When asked if she guessed her friend, Joel replied: ‘No, absolutely not, it was a huge shock. It was brilliant.’
Last year saw Joss Stone take the crown as Fox and the year before Nicola Roberts was the winner with her performance as Bumble Bee.