A just-married and pregnant Ashlee Simpson will step out for a short tour next month to support her new album, "Bittersweet World."The 23-year-old pop-rock singer is scheduled play a dozen dates in the eastern US beginning June 9 in Chicago. She also has a June 14 booking at the Atlantis Resort in Nassau, Bahamas. Her US itinerary is listed below.Simpson has been a busy lady over the past few months: In addition to making the promotional rounds to push "Bittersweet World," which dropped April 22, she married Fall Out Boy bassist Pete Wentz May 17 and the couple recently announced they are expecting a child. People.com recently reported that Simpson will take Wentz's last name, but plans to use the professional name Ashlee Simpson-Wentz.