The couple just released a statement saying, "With absolute love and respect we decided to separate as a couple earlier this year. 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."
The two were together in July.
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The couple has one child, 4-year-old Axl.
They initially began dating when Fergie appeared on Duhamel's show, "Las Vegas." They dated 5 years before tying the knot at a lavish event in Malibu.
During their marriage, the two would often talk about their love affair -- even appearing on Oprah together -- Josh said Fergie was the yin to his yang, and the best thing that had ever happened to him.