jamespackermariahcarey

*Get out the popcorn again! The drama between Mariah Carey and James Packer just landed in the extreme zone.

Now the songbird Has supposedly made a demand on James Packer … pay her $50 mil … or else.

Sources connected to the now warring ex-couple tell TMZ … Mariah believes James has cost her tens of millions of dollars, and here’s why:

— She claims he got her to move from New York to L.A., uprooting her entire life, so he could be near his kids.

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— She claims the incident on the yacht in Greece — where she says he did something awful to her assistant — has traumatized Mariah so much she had to cancel the South American leg of her tour.

— He made various financial promises to her.

As of this posting, there’s been no response from Packer.