During an interview promoting Shrek 3, Justin Timberlake spilled the beans on his time in the studio with Madonna.

"She’s Madonna.... It doesn’t get any cooler than that! We actually wound up with 5 or 6 REALLY good songs, some unfinished, some finished and were gonna go back in July and finish some more stuff"

Asked if he’ll be singing with her, Justin said "Possibly, yeah!"

Justin says "I’m just a fan .... I’m a fan who tricked Madonna".