Did JULIE ANDREWS have an affair with RICHARD BURTON? The squeaky clean 'Sound of Music' and 'Mary Poppins' star is spilling the beans in her new autobiography, Home: A Memoir of My Early Years, and she reveals that ELIZABETH TAYLOR's ex "behaved kind of badly" onstage -- and off -- during their Broadway production of Camelot!

"I was so grateful he didn't [come on to me] in the beginning of the show, because he was just undeniably wonderful," Julie tells our own MARY HART. "But by the time he decided it was my turn -- and I was probably one of the few people in the company that he hadn't wooed in some form or another -- by that time I knew him very, very well. I think you have to read the book -- he behaved kind of badly."

"Over the course of a week, he suddenly behaved as if I was utterly distasteful to him after [almost a year of] working wonderfully together," she explains. "I thought, 'This makes me really angry,' and so I didn't speak to him for a week. Then he came to my dressing room and tried to make nice, and I told him in several Anglo Saxon four-letter words to get the hell out."

But was Burton really trying to anger Julie, or simply to get a rise out of her for his own enjoyment?

"I realized I was supposed to be the next," she concludes. "I got smart, and [after] about two more performances, he said, 'All right, I'm sorry,' and he slapped me on my bum, and I slapped him on his bum, and we were friends forever more."