Morissette joins other celebrities also working with the Gap, including Joss Stone, Brandon Boyd, the group Incubus, John Legend, Michelle Williams, Jason Mraz and Liz Phair in the fall campaign.
In the ads, the artists do their interpretation of their favorite song. Morissette performs part of Crazy by Seal.
A limited edition CD of the 8 songs performed by the various artists will be available for purchase on September 1.