LOS ANGELES — Newlyweds Ashlee Simpson and Pete Wentz say they are expecting a baby.

The pop singer, who recently announced that she will be officially taking her husband's last name and performing as Ashley Simpson-Wentz, made the announcement in a statement posted on her blog.

She says there was much speculation about her pregnancy, but says she and Wentz wanted to wait until after the first trimester to publicly make the announcement.

Simpson-Wentz, 23, and Fall Out Boy bassist Wentz, 28, exchanged vows earlier this month at the Simpson family's Los Angeles-area home. Sister Jessica was the maid of honor.

The couple began dating in fall 2006 and announced their engagement April 9.