Obviously there's no way to know for sure but let's just make some predictions.

There's a BIG chance that she's releasing a new album late this year as she's said to be getting paid an extra 2 million to perform on X Factor, and britney herself said just last year that she's only taking a short break.

So taking all of this into account: A holiday release, a (likely) hit single and a performance on x factor how much do you think it will sell first week and in total? Both in the US and Worldwide.

Will it sell more than FF or less?

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Considering all those factors, maybe 400K first week and 1.3 (?) million total U.S. I don't know about worldwide.

Femme Fatale suffered from little promotion, but she's nowhere near the album seller she used to be, regardless of the amount of promo she gets.

If she actually promotes, maybe 350-400k

If she releases in the Holidays I say another 500K like Circus.

300k .. after me doing all them estimate for Nicki , I have to lower down them estimates ..

1 million worldwide.

It'll do better than Femme Fatale.

It's way too hard to predict. If she keeps to the same style of music (upbeat club anthems) and same level of "performances", then she won't do much more than FF regardless of promotion or release date. Maybe 1 million US total and 2 million WW.

Britney needs a huge overhaul in pretty much all aspects to sell big again. People are done with the sex kitten thing. And I honestly think she's done with it, too. Her handlers need to realize it.

With a November, December release and a performance of the first single at some big tv show, I think she can pull +400k, maybe even 500k. Promoting right, probably 4M worldwide at the end.

Depends on when she releases it. If she does a fourth quarter release with strong promotion about a month before the album drops and everyone knows she has a record coming out I could see her selling 400k. Femme Fatale suffered from little to no promotion. I could see her selling 1.3 million total in the US with 3 million sold worldwide if she promoted her work properly. Sales in general are declining though so we will have to see.

If it's released on the right time like Circus was then 500-600k US and 1.5 WW.

Platinum in the US, 2.5 Million WW

375k, 700k First Week

500-700k opening in the US, approximately 1 million WW. 2-2.5 million total in the States, 4.5-5 million WW.

We have what reality shows did for other judges and her career isn’t dead. Everyone else's was when they joined their shows.

Depends on the music, but its going to be less than FF if she keeps this up.