Britney Duet....Christina, Madonna or Shakira?

Okay now that Britney Spears' Circus Tour is getting ready to go full gear, what's her next step?
I'm thinking duet.
But with who?
Well we know Madonna likes her, they actually did a music video for "Me Against The Music".
But that's been done.
How about Christina Aguilera?
Okay, we all know what happened last time Britney, Christina and Madonna were onstage together. But while Britney spiraled down out of control, Christina has looked like an angel. So maybe hanging out with Christina would actually help Britney.
Then of course there is my wild card and my favorite idea.
Shakira.
Just imagine a Shakira / Britney song or video.
Not bad huh?
Back in 2002 there were even rumors of a feud between the two.
So what better way to smooth everything out than a song?
Okay, maybe contacting the WWE and getting a match set up for Wrestlemania, but I'm trying to be realistic!