"I'm With You" is the third single from Avril Lavigne's debut album, Let Go. After both "Complicated" and "Sk8er Boi", two upbeat songs, had their runs globally, Lavigne decided to release a ballad from her album, and "I'm With You" got that honour.

Unexpectedly, the song performed better than "Sk8er Boi", managing a peak at #4 on the Billboard Hot 100, and #1 in over ten other countries.