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Wilde covered up in a black polka dot printed chiffon dress by Gucci, paired with a white bow at the neck and a slim belt.
Even the side boob-revealing sheer panels and choice of bright red lipstick couldn't sex up the matronly look.
Despite the rare fashion misstep, the 27-year-old actress is having a pretty amazing week.
She was just named the new global ambassador for Revlon (along with Emma Stone) and on Monday,
Her extra-long ponytail dressed up with clear elastics, garnered tons of praise from beauty critics who loved the unique summer 'do.