The post shows Winfrey with Chicago Mayor Lori Lightfoot and her wife Amy.
In the post Oprah wrote, "Look who came for dinner @chicagosmayor and wife Amy. Our first time meeting. #sweethomechicago."
Mayor Lightfoot said the dinner was last Thursday at Oprah's California home. Dinner included beef, roasted chicken and vegetables.
"It was great...she's a tremendous person," Lightfoot said.
Last month, Lightfoot became Chicago's first African-American woman and first openly gay mayor.