In an interview with Allure magazine, the singer said counseling has improved their marriage.
Duhamel is "not afraid," she says. "He doesn't feel like he's not man enough," she added.
Counseling has made the superstars extra close-too close, some might argue.
Fergie and Duhamel met in 2004 on the set of Las Vegas and got married in 2009.
"We just grew. And we grew into realizing that we wanted the same things in life. We wanted the same path. We both come from Catholic families," Fergie said.