DOLLY ON MISSION TO SAVE BILLY RAY

Doesn't want Liz giving her pal an achy breaky heart

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Elizabeth Hurley and Billy Ray Cyrus are enjoying their new romance

COUNTRY queen Dolly Parton's friendship with love-challenged troubadour Billy Ray Cyrus goes way back, and sources say she's worried that his new girlfriend, Brit maneater Elizabeth Hurley, will leave him with an Achy Breaky Heart!

Time is of the essence as the unlikely romance seems to be heating up fast.

"Dolly's worried that Billy Ray is out of his weight class with Liz," spills an insider. "For all his faults, she's still close to him and knows he's vulnerable and bound to be hurt by this flighty character, who's the very definition of high maintenance."

Firerose and Billy Ray finalized their divorce last August