It is said that it's the best single since Toxic.
Swedish producer, Shellback, who's collaborating with Max Martin & Dr. Luke on Britney's new album :
Q: "How is it working with her?"
A: "She's actually damn professional"
It's said to sound like "Shattered Glass" off Circus, a song Dr. Luke also produced.
Arrrrrrrrrrg I just can't wait!! Maybe the song will leak before January 7th.