Billie Eilish sings in Spanish for the first time in her long-awaited collaboration with ROSALÍA

• Billie Eilish and ROSALÍA released their long-awaited collaboration, "Lo Vas a Olvidar," on Thursday.

• The song, produced by Finneas O'Connell, was made for a special episode of HBO's "Euphoria."

• It marks the first time Eilish has recorded a song in Spanish.

• Visit Insider's homepage for more stories.

• Read more:

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• 19 songs you probably didn't know were written or produced by Billie Eilish's brother Finneas

• The first trailer for Billie Eilish's documentary is here and it shows her toe the line between normal teen and global star

• What we know so far about season 2 of HBO's 'Euphoria'

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