Justin and Micheal Jackson

Mary J. Blige & Mariah Carey.

THAT would be hot.

good one!

J.Lo & Amerie and Janet
J.Lo & Gwen
Gwen & Jack White (The White Stripes)
J.Lo & Bono (U2) (this happens ...but this never leak :/)
The Libertines & The Artic Monkeys
Madonna & Eminem
Madonna & Jamiroquai
Chris Martin & Lily Allen
Jack Johnson & Norah Jones

I'm telling you -- JANET AND MADONNA....all of you know that would be a video in a half! The production quality would be off the hook. They both have mediocre voices, but they would be hot on a dance track.

Kelly clarkson & Avril Lavigne
Kelly Clarkson & Mariah carey
Kelly Clarkson & JoJo

I have a couple of more

Jessica & Ashlee
Madonna & Kylie
Aaliyah & JoJo ( would have been a great collabo)
Kelly Clarkson & Xtina

Britney & Pink

I agree that that would be a hot collabo. Mariah and Mary can sing and I think a collabo from them would give them both great claim and success for their careers.

Mariah and Mary would be hot!!

They can do a track called "We Belong Together cause I Cant Be Without You"

But I'll think they'll both do their best to upstage each other. Mariah and Mary, that is.

some real hot collaborations would be...

Jennifer Lopez & Juanes (Produced by Luny Tunes or Stargate)
Danity Kane & Jay Z (Produced by Just Blaze)
Kelis & Paul Oakenfield
Britney Spears & Sean Paul (Produced by Polow)
Christina Milian & Pharell (Produced by Swiss Beats)
Robin Thicke & Nelly Furtado
Rob Thomas & Joss Stone
Kelly Clarkson & Daughtry
Beyonce & Chamillionare (Produced by JR Rotem)

or the hottest collaborations EVER..

Shakira & Wisin y Yandel (Produced by Scott Storch) --> For me =)
Fergie & Kanye West (Produced by Kwame)