Then, her full-length Bittersweet World will hit stores and be available digitally on 4/22. Ashlee collaborated with some major players on this album including Timbaland, The Neptunes' Chad Hugo, and Kenna.

She felt "very lucky to work with people who are at the top of their game." Listen to "Little Miss Obsessive" and judge for yourself. - It's streaming here.

Preview and Purchase Ashlee Simpson CDs