'The Voice' Contestant Records 'Love Letter' to Kim Jong-un ... While Dissing James Franco

Judith Hill -- who's signed to Sony's music label and was a contestant on "The Voice" -- recorded a new track giving praise to Kim Jong-un while roasting James Franco ... and now it's leaked online.

Hill originally wrote an ode to James Franco and reportedly submitted it to "The Interview" producers for the soundtrack. But when it didn't make the cut -- and the hacking scandal went down -- she changed the lyrics and the title to "A Love Letter to Kim Jong-un."

According to Page Six ... Hill was attempting to mediate peace between North Korea and the U.S. by making K.J.U. the object of her affection in the song. Some choice lyrics:

- "You got me transcending heaven, so don't be confused ... James Franco ain't got nothing on you."
- "I could wait here 127 hours ... it's true ... there's only Oscar and baby it goes to you." 

Hill was reportedly signed to Sony last year ... and is best known for performing with Michael Jackson in the movie "This Is It." She placed in the top 8 on "The Voice."