Out tomorrow or Wednesday on iTunes.

Taken from her upcoming re-release, Pink Friday: Roman Reloaded - The Re-Up, out on November 20th.

The song features another female artist, and will be performed on her UK tour, so it's probably the new UK single as well.

The fact that it features another female artist doesn't sound very promising. Maybe it'll be Christina Milian.

Why Christina Millian of all people lol is it because she is on young money I doubt it would be her looking forward to this

It would be pretty cool if Misha B was featuring on it but I highly doubt that.

Susan Boyle perhaps, she's been suspiciously quiet recently

Hmm interesting
My guess is Misha B

I think it will be Katy Perry.

But I think Ciara would work well, as would Jlo.

Christina Aguilera probably

Looking forward to this as its a rap track, i think it'll probably be another female rapper. Other ones i've thought possibly are Ciara or Ke$ha. I also saw Jordin Sparks mentioned on another forum.

I think its Misha B !

It will be bloody Rihanna, mark my words !

Missy Elliott?

My sentiments exactly. Don't see how it couldn't be Rihanna. She's just announced a new world tour and is recording in London at the moment. She needs as much exposure as possible. It would also put a stop to all the hate rumors between Rihanna and Nicki the VMAs.

Nah I can't see it being Rihanna, they have worked so much together I think Nicki will have someone she hasn't worked with or worked with as much on the track. Can't see it being Rihanna, HOPE IT ISN'T RIHANNA!!

You really think Nicki is going to be a virtually unknown UK rapper on the lead single of a new project? OH PLEASE.aybr as a UK remix but not an international release.

Maybe Eve? She's a female rapper and it would be good for Eve as she hasn't barely done any music for about seven years despite several collabs

Apparently the artist is "relevant" so not sure if it could be her or not.

Cassie tweeted Nicki about working on a video at the end of August so it could possibly be her.

Diana Vickers

I like the sound of a lot of these suggestions, especially Ciara, Missy Elliott, Eve, Cassie and Christina Aguilera. They're all awesome.

Which is why you'd hope they have a bit more common sense and self respect!

It definitely wont be her, it has to be someone relevant and probably big in the US as it'll only be released in the US.

Nicki gave a hint of the female guest. It will be someone "Pretty". Hmmmm

Nicole Sherzinger?

Nicole Scherzinger, maybe? She has a song called "Pretty".