The mogul, her BFF Gayle King and four staffers from O magazine popped into fine dining spot District Commons in Washington, D.C., on Thursday, where they didn't go unnoticed.
Approached by other guests, Winfrey didn't seem to mind the attention.
"She was so easygoing," an onlooker tells PEOPLE. "She stopped to talk to people and took photos [with fans] right outside of the bathroom."
– Liza Hamm
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