Princess Isabella has sparked backlash for her family after she was caught wearing a vulgar t-shirt at a Danish music festival, RadarOnline.com can reveal.

Queen Mary and King Frederik were shamed by royalists after their daughter was photographed wearing a black t-shirt reading "f----- him yesterday" with an arrow pointing to the side in bold white letters at Smukfest in Skanderborg.

Isabella, 18, attended the festival with her older brother, Crown Prince Christian, 19. Article continues below advertisement

Bold Message Source: @CHRISTINSQUEENS/X

Isabella wore a shirt reading 'f----- him yesterday' in bold white letters at a music festival.

The teenager celebrated her 18th birthday in April with a grand celebration fit for a real-life princess. The Danish royal family marked th

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