Mariah Carey -- My Billionaire Boyfriend Needs Spiritual Advice Before Popping Question

Mariah Carey and her billionaire boyfriend are taking a giant leap -- jetting to Israel for what they call a "pre-engagement spiritual meeting" with a religious muckety-muck.

Sources connected with the newly-minted couple tell TMZ, Mariah and James Packer are jumping on his jet today, where they will meet a "spiritual leader" who James knows well. We're told James believes the meeting is a must before he pops the question.

Our sources say once the meeting takes place, the ball will roll quickly and "they will be married soon."

Packer doesn't want the name of the spiritual leader or the location disclosed for security reasons.