* (You Drive Me) Crazy (co-written with Jörgen Elofsson and Per Magnusson)
* Lucky (co-written with Max Martin)
* Stronger (co-written with Max Martin)
* Toxic (co-written with Bloodshy & Avant)
* Everytime (co-written with Annette Artani and Frankie Previte)
* Piece of Me (co-written with Bloodshy & Avant)
* Gimme More (co-written with Danja)
* Womanizer (co-written with Nikesha Briscoe and Rafael Akinyemi)
* Circus (co-written with Lukasz Gottwald, Claude Kelly and Benjamin Levin)
* Hold It Against Me (co-written with Dr. Luke, Max Martin and Bonnie McKee)
* Till the World Ends (co-written with Dr. Luke, Max Martin and Bonnie McKee)
* Criminal (co-written with William Orbit, Claude Kelly and Bonnie McKee)