Justin Timberlake wrote Rehab and Cole case love for Rihanna's GGGB and Rated R album. He also wrote a track on Britney's third album titled What's it like to be me.
Shania Twain wrote Don't let me be the last to know, the fourth single from Britney's Oops i did it again album.
The neptunes produced and wrote Britney's dance hit, I'm a slave for u. They also produced her other song Boys. I'm a slave for u gave The Neptunes their first worldwide number 1 hit.
Moby wrote Early morning, a track on Britney's In the zone album.
P diddy wrote The Answer, a bonus track for her fourth album only on the European editions.
My Baby from Britney's Circus album is a song about her two sons.
Lady GaGa wrote Quicksand for Britney, a song on the european deluxe edition for her Circus album.
Long Way to be happy from Pink's I'm not dead album is about sexual abuse.
Tony Kanel, a band member of No Doubt and Gwen stefani's former fiance produced Sober, Funhouse and Crystal Ball from her Funhouse album. Funhouse is the only track he writes as well as produces.