Elton John is desperately worried that close pal Elizabeth Hurley 's whirlwind romance with Billy Ray Cyrus could lead to a hasty marriage , and he wants the model to protect her fortune, RadarOnline.com can reveal.

The music icon, 78, is concerned that Hurley's massive net worth dwarfs that of her boyfriend and is pleading with her to get a prenuptial agreement in place. Article continues below advertisement

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“Elton’s just one of a few friends who are worried she’s being hasty,” a source dished about Hurley, 60, and Cyrus's unlikely romance moving at warp speed .

The spy pointed out the disparity between the duo's net worths.

"Billy's only worth about $15million, and there's no question he’s been bad with hi

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