Turns out she was just lip syncing the words to her marriage vows. :P
"Another Hollywood marriage — with strong Chicago connections — has unraveled. Ashlee Simpson filed for divorce from North Shore native and Fall Out Boy rocker Pete Wentz — citing those usual “irreconcilable differences.”
Despite recent sightings of the couple outwardly appearing happy, a source close to Wentz told me Wednesday, “They have gone their separate ways for quite some time. … Ashlee and Pete have not really been on track for the past year.”
According to that source and one closer to Simpson, the duo finally came to the realization they had little in common.
While Wentz is disputing a Simpson claim that she could not deal with his “erratic” behavior, the musician does like to party a lot, and Jessica Simpson’s younger sis reportedly has become more a homebody since the birth of the couple’s son Bronx, 2."
http://www.suntimes.com/3735529-417/pete-wentz-ashlee-simpson-fall-out-of-love-part-ways.html