I see no reason why it could be fake. Don't recognize the picture. And if it is real, the HQ has yet to come.
For the record, I would be very happy if it was real!
EDIT: Embarassing. I even knew the picture used. *hides*
I'd love this song to be with Brit, but she'd look a bit desperate having the albums first two singles with a featured artist. But since they worked together before, it could be different.
Let's not forget Me Against the Music production. Madonna was added just before the single release.