Celebrities almost always have their makeup done professionally before major red carpet events – but that doesn't stop them from having blunders.

While a star's makeup may look perfect to the human eye, a camera flash can tell a different story. There's certain foundations thats are ideal when shooting HD video, but light up when a flash is around – celebs like Miley Cyrus and Angelina Jolie know this all too well.

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Scroll through the gallery to see some of the most cringeworthy celebrity makeup mistakes on the red carpet.