Ashlee Simpson and Pete Wentz

Ashlee Simpson-Wentz has filed for divorce from Pete Wentz after nearly three years of marriage.

"After careful consideration, we have made the difficult decision to file for divorce," the couple said in a statement through a rep. "We remain friends and deeply committed and loving parents to our son Bronx, whose happiness and well-being remains our number one priority. We ask that everyone honor our privacy as we navigate this next phase of our lives."

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Simpson-Wentz, 26, filed papers Tuesday in Los Angeles Superior Court, citing "irreconcilable differences," according to TMZ. She is seeking joint legal custody and primary physical custody of their 2-year-old son, Bronx Mowgli, in addition to spousal support. A date of separation was listed as "to be determined."

Simpson-Wentz started dating the 31-year-old Fall Out Boy bassist in 2006. They announced their engagement in April 2008 and married a month later in a ceremony officiated by her father, Joe Simpson. The couple announced shortly afterward that they were expecting their first child.