Call the doctor - Solange Knowles went completely polka-dotty as she arrived at the Ed Sullivan Theatre for her appearance on The Late Show With David Letterman.
Queen B's sis was actually looking super-cute in the slightly 60s ensemble, which included the main statement piece - that bold-spot long-sleeved coat dress - which she paired with a tan waist belt, T-bar stilettos and megawatt, red-lipped smile.
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We love how she's made a cover-up look like a bona fide minidress... Bey might want to start protecting her Best-Dressed Sibling crown.
See Solange's sister's style evolution below: