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While promoting her two new flicks, The Change-Up and Cowboys and Aliens, Olivia Wilde, has been showing off her impressive sartorial skills in everything from red-hot structured sheaths to custom-made beaded creations.

But the star's flawless style tour came to a screeching halt when she turned heads for all the wrong reasons at the London premiere of Cowboys & Aliens on Thursday night.

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.