And we thought they would last forever! After three years of marriage and one child, Ashlee Simpson filed for divorce from her Fall Out Boy husband Pete Wentz.  The reason? The ever popular irreconcilable differences which Simpson filed in a Los Angeles Court yesterday. This was surprising because both were smitten with each other according to their tweets. Simpson is asking for spousal support from Wentz as well as full legal custody of son, Bronx. This just means that something happened that made their marriage go downhill so fast! Yes, there will always be couples who separate immediately, but Ashlee and Peter was the couple that had love written all over them.