With an engagement to and child on the way by rocker Pete Wentz, Ashlee Simpson has had a lot on her mind besides her own music. But into the tabloid maelstrom comes her third Geffen album, "Bitterswe

With an engagement to and child on the way by rocker Pete Wentz, Ashlee Simpson has had a lot on her mind besides her own music. But into the tabloid maelstrom comes her third Geffen album, "Bittersweet World," due this week.

The set features production from Timbaland and the Neptunes' Chad Hugo. The first official single, "Little Miss Obsessive," boasts guest vocals from the Plain White T's Tom Higginson.

Simpson indulges her '80s fetish throughout the project. The sassy "Boys" imagines the Cardigans' "Lovefool" atop a Chic rhythm, and there's a "Beat It" vibe on the chugging "Ragdoll." "I almost wish I lived my 20s in the '80s," says Simpson, who was born in 1984. "A lot of the record is a bit cheeky. Sometimes I'm writing about something serious, but it was fun for me to kind of goof around as well."

Simpson put in a fair share of 14-hour days in the studio; often she'd leave at night and return the next morning to find that Hugo had crafted a song based on conversations from the previous day. "Everybody really had their hands in this album," she says.