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Forget common phobias like being afraid of the dark or spiders -- having other people do her laundry for her is what really freaks country superstar Carrie Underwood out.

In an intimate interview with Oprah at her cabin retreat in Nashville, Tennessee for Oprah's Next Chapter, Underwood is asked about the one thing she still likes to do for herself even though she obviously now has access to a plethora of staff.

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And surprisingly, it's a household chore.

"It makes tour life a little more difficult because those are things I really don't have time to do, so that's what I do on my days off. We go to the Laundromat," she laughs. "I get my quarters, we go to the Laundromat, and we go do our laundry. ... I just don't like other people doing my laundry. It freaks me out."

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Watch the rest of Underwood and Oprah's cozy chat, which includes her and her pro hockey player husband Mike Fisher's first joint interview, this Sunday at 9 p.m. ET/PT on OWN.