Bittersweet World is the third studio album by singer Ashlee Simpson. It was released in the United States on April 22, 2008. Simpson worked on the album with producers Timbaland, Chad Hugo, and Kenna. It has been described by Simpson as a "fun party album" with a "silly and quirky" side and some influence from 1980s music. She has also described it as having a more beat-oriented sound than her first two albums, Autobiography and I Am Me, although still retaining some of those albums' guitar-based sound.