CHER is back with an all-new show at Caesars Palace in Las Vegas, debuting Tuesday, May 6, and the ageless diva pulls no punches with ET's own MARK STEINES in an exclusive interview!

"Everybody thought I was such a ho ... because of the way I dressed," the Grammy winner says about her early days in show biz. "People would make fun of [SONNY BONO] and I. Actually, they used to punch him in the nose because we looked so weird and they were so frightened of it. People don't look beneath anything."

Cher says her new show at The Colosseum is full of chart-topping hits spanning from the '60s to today, featuring extraordinary choreography, state-of-the-art lighting and special effects and, of course, her signature, breathtaking costumes. But will this be her last hurrah onstage?

"Who knows," she muses. "Every year critics say, 'She's on her way out,' but I'm still here and who knows why? I have no reason why!"

Plus, she's already contemplating what she'll do for an encore: "I'd do acting again because I love it," she says. "I'm not really a singer; I'm a better actress."

Cher's 90-minute show will be presented four nights a week on Tuesdays, Wednesdays, Saturdays and Sundays.