Tonight's live show will see Marcus Collins performing on a JUMBO JET, while Little Mix will roar into Wembley Arena on HARLEY-DAVIDSON motorbikes.
But Amelia will sing with just a group of backing dancers.
TV Biz yesterday watched as Marcus rehearsed with 25 dancers who proceeded to shake their stuff on the jet's nose.
He is singing OutKast smash hit Hey Ya! as one of his songs. He said: "The plane wasn't my idea but I'm thrilled with it."
Little Mix have done a version of The Source's club classic You Got The Love ? recently covered by Florence And The Machine ? and perform in front of a giant screen with animated female soldiers doing the band's mentor Tulisa's arm salute.
The soldiers look just like former judge Cheryl Cole.
Little Mix star Perrie Edwards said: "We have lots of input in what we do, so we thought this would be a cool idea. Bombing around on the back of the motorbikes we're thinking 'yes, this is a good idea'."
Teenager Amelia is performing Christina Aguilera's Ain't No Other Man.
Last night sources suggested Amelia had been let down by her mentor Kelly. One said: "Amelia looks at a distinct disadvantage for the final.
"Marcus and Little Mix have gone all out and raided the production budget for their props.
"Kelly could have secured something extravagant for Amelia but she just wants her to go out there and sing. It's a high-risk strategy as what you're looking for is a memorable performance that will make people pick up the phone."
TV Biz can also reveal that Amelia had a backstage meltdown on Thursday over her CHRISTMAS song.
She had been practising Wizzard's I Wish It Could Be Christmas Every Day but blew a gasket after she failed to nail it.
She demanded show bosses give her another song and is now rehearsing Mariah Carey's All I Want For Christmas Is You.