TMZ and UsMagazine.com reported the legal papers were filed in Pasadena on Friday.
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The former couple announced in September 2017 that they had separated after eight years of marriage.
"With absolute love and respect, we decided to separate as a couple earlier this year," they said at the time. "To give our family the best opportunity to adjust, we wanted to keep this a private matter before sharing it with the public. We are and will always be united in our support of each other and our family."
Fergie, 44, and Duhamel, 46, have a 5-year-old son named Axl.
They began dating in 2004.
