The couple announced their separation on Nov. 23, after months of intense speculation from tabloids.
Upon entering the union in October 2002, Lachey, 32, was the bigger earner of the two and arguably the bigger star. But since that time, Simpson has gone from a middling pop star to an A-list megastar, earning $30 million last year alone.
Earlier this year, Simpson, 25, made her big-screen debut, playing Daisy Duke in The Dukes of Hazzard. She also lent her name to a line of cosmetics and fragrances and released both a solo and Christmas album in 2004.
Lachey’s most recent ventures included the release of his 2003 solo album, SoulO, and a string of appearances on the WB’s TV show Charmed. He’s set to reunite with the TV network next year when he stars in a pilot about a newly single bachelor.