Denmark's Queen Mary is known for her elegant yet fashion-forward outfit choices , and normally, her teenage daughter, Princess Isabella follows in her footsteps – sometimes even borrowing directly from the Queen's wardrobe .

So, it came as a surprise to royal watchers this week, when 18-year-old Princess Isabella stepped out in a slogan T-shirt with a risque phrase emblazoned on it.

The teenager attended the Smukfest festival in Skanderborg, watching Danish band Suspekt, wearing a black top with a lyric from the band that translates in English to "[Expletive] him yesterday."

© Getty Images Princess Isabella has borrowed from her mother's wardrobe before

Princess Isabella added an orange bucket hat with the band's name on it, too, so she is clearly a fan - and she is reportedly n

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