I was just thinking of collabos I would want to see but would probably never happen a million years.

Janet & Madonna = Mind shattering

Micheal Jackson & Prince = Universe stops

Kelly Rowland & Lady Gaga = That song would be the def. of insanity

Ciara & BoA = Old heat meets New Heat

Beyonce & Rihanna = Sexy meets Edgy

Who do you want to see hookup?

Britney Spears and Shakira.
Britney Spears and Jennifer Lopez.
Jennifer Lopez and Shakira.

Feist+Cat Power
Radiohead+Portishead

Britney and Justin
Britney and Kanye
Rihanna and Kanye
Lily Allen and Coldplay

Britney + Ciara
Britney + Rihanna

Britney + Christina

Aly & AJ + The Veronicas
P!nk + Kelly Clarkson
Miley Cyrus + Hilary Duff
Taylor Swift + Carrie Underwood
Jordin Sparks + Leona Lewis
Mariah Carey + Leona Lewis [Though, it would probably sound like the Mariah/Whitney track. ]

Kelly Clarkson & Pink
Carrie Underwood & Shania Twain
Kelly Rowland & Andre 3000
Shakira & Nelly Furtado
Pink & Bono
Alicia Keys & Leona Lewis
Rihanna & Kevin Rudolf (i think this one would be interesting, even though I've only heard his one song lol)
Rihanna & Beyonce
Fergie & Justin Timberlake (I know they worked together on the BEP record, but it'd be nice to hear a song with him on her next solo album)
Kelly Rowland & 50 Cent
Lady GaGa & Nelly Furtado
Janet Jackson & Justin Timberlake (Project Wardrobe Malfunction 2010! lol)
Jordin Sparks & Leona Lewis
Sheryl Crow & Jon Bon Jovi
Sheryl Crow & Bruce Springsteen
Christina Aguilera & Whitney Houston
The Wreckers / Michelle Branch & Jewel
Michelle Branch & Kid Rock
Justin Timberlake & Kanye West
Lady GaGa & Rihanna
Kelly Clarkson & Jason Mraz
Destiny's Child (reunited), T-Boz & Chili
Madonna & Janet
No Doubt & Pink
Timbaland collabs for a future album I'd like to see - Coldplay, Michael & Janet Jackson, Fergie, Gwen Stefani, Lady GaGa, Linkin Park

How about Hayley Williams and Avril Lavigne?
And Katy Perry and Lady Gaga?

Cassie + Ciara
Brandy + Natasha Bedingfield
Leona Lewis + Fergie
Jazmine Sullivan + Keyshia Cole
Leona Lewis + Ne-Yo
Cassie + Ashanti
Cassie + Keri Hilson
Cassie + The Pussycat Dolls
Cassie + Justin Timberlake

Perez Hilton + Michael Jackson

Lady GaGa & Britney!!!!
September & Lady Gaga.

Mariah + Cassie

Be more creative? There are a million other artists. Let me guess, here's the rest of the list:

Jennifer Love Hewitt and Britney Spears
Jennifer Love Hewitt and Jennifer Lopez
Jennifer Love Hewitt and Shakira

Oh boy!!!

Jesse McCartney (yes I picked him) and Flo Rida An instant hit.

Justin Timberlake + Britney Spears
Saturdays + Girls Aloud (Bit too much I think)
Shontelle + Rihanna
Eminem + Flo Rida
David Archuleta + David Cooke
Jack White + Chris Martin

Beyoncé & Christina

Beysus Will never perform with Fake singers like Britney spears.. sorry, she is actually singing her songs.. not dancing to them badly.

Beysus & Dr.Dre\Tupac

the 2 best pop singers out right now.

Matchbox 20 + Kelly Clarkson