By Artist Shaan

Before meeting the royal family, Billie Eilish was "very worried" about the "protocol."

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Billie Eilish and her brother FINNEAS had the chance to interact with Kate Middleton, prince William, and the then-prince Charles.

The siblings were there since they wrote the song that served as the movie's theme song.

In a recent interview in Australia, Eilish talked openly about meeting the royal family in light of the passing of Queen Elizabeth II last week.

Before meeting the royals, the singer remembers being "very nervous" about knowing all the appropriate protocol. 

"I was prepared to bow. I was prepared to decline a handshake.