Britney Spears es incluida en el disco "Now That's What I Call Music" Volumen 19, el cual saldr? el 26 de julio del 2005. Este disco incluye los exitos del momento, aqui esta el tracklist:
1. Gwen Stefani- Hollaback Girl
2. Britney Spears - Do Somethin'
3. Black Eyed Peas- Don't Phunk With My Heart
4. Ciara f/ Ludacris- Oh
5. 50 Cent f/ Oliva - Candy Shop
6. J. Lo f/ Fat Joe- Hold You Down
7. Baby Bash f/ Ludacris - Suga Suga (Gimme Some)
8. Akon- Lonely
9. Amerie- One Thing
10. Natalie- Goin' Crazy
11. Shakira- La Tortua
12. Mariah Carey - Its Like That
13. Rob Thomas- Lonely No More
14. Coldplay- Speed of Sound
15. 3 Doors Down- Let Me Go
16. Chevelle- The Clincher
17. Garbage- Why Do You Love Me?
18. Crossfade- Colors
19. The Mars Volta- The Widow
20. Lifehouse- You & Me