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30 Unforgettable Outfits Celebs Wore When Meeting Royals

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On the red carpet, A-list celebrities often look like royalty with their billowing ballgowns and regal silhouettes. But what happens when they actually meet royalty? They can't just recycle a sheer, plunging gown to meet the Queen of England, after all.

For stars such as Rihanna and Lady Gaga who've mingled with the likes of Prince Harry and Her Majesty, they often incorporate their personal style — in a far more conservative tone — for the privileged occasion of meeting the British royal family. 

From chatting with Prince William and Kate Middleton at the BAFTAs to shaking hands with Her Royal Highness, here's what celebs wore when the worlds of Hollywood and royalty have collided.