Simpson's spokesman, Rob Shuter, refused to comment on magazine reports that Simpson and Lachey had yet to complete a financial agreement.
They split at the end of 2005 after three years of marriage, RTE.ie reports.
Lachey, 32, is promoting his album "What's Left of Me," while Simpson, 25, is recording a video for her new single, "A Public Affair," after starring in last summer's movie "The Dukes of Hazzard, " according to Reuters.
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