Sir Paul McCartney attended the Adopt-A-Minefield event with sweetie Heather — a model who lost a leg in a traffic accident — and soothed her swiftly after a clumsy waiter burned her bare shoulder with a HOT coffeepot! Heather cried “OUCH!” — and Paul had to comfort her AND the horrified waiter, who started bawling. “It’s allright,” the ex-Beatle told Weepy Waiter . . . then he whispered to Heather, “I’ll kiss the boo-boo!” As Hollywood-ites looked on goggle-eyed, Sir Paul licked and kissed Heather’s ouch-ie! And pretty soon. . . ALL GONE!