I'm assuming you're asking about 'The Devil Wears Prada 2' or a character named Jax.
However, I found there is a band called "The Devil Wears Prada" from Ohio, and they have a song titled 'Jellyfish' but there is no known song by that name called "Jax" however I found they do have a song called 'Jellyfish' but the band does have a song called 'Planet A' however they do have a song called 'Jawbreaker'
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