Furious Paul McCartney wouldn't let it be, and threw his fiancée's $21,000 engagement ring out of a Miami hotel room while the twosome tangled.

But when the former Beatle — slated to marry Heather Mills on Thursday — finally calmed down, he asked security at the Turnberry Isle Resort and Club to search for the diamond-and-sapphire band.

"Yes, it did happen, but we're not allowed to talk about it," the resort's assistant manager, Rudolph Gimmi, told News of the World yesterday.

The ring was later found by a security guard, and a relieved McCartney passed on a $1,650 tip for the man who found the jewel. The newspaper said the fight occurred after the superstar's Ft. Lauderdale concert on May 18.

Staffers told the newspaper that the rock 'n' roll legend was shouting, "I don't want to marry you. The wedding's off."

However, the creator of classics like "Yesterday" and "Hey Jude" quickly switched gears after the blazing battle. Mills, 34, has been the performer's constant companion since April 1999. They were engaged last July.

Hotel publicist Carmen Ackerman confirmed there was an incident involving the ring but said that it "fell" from the balcony.

The spectacular ring was found in dense undergrowth and, when McCartney heard the good news, he bought Gimmi a first-class ticket to hand-deliver the ring to London.

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