Donny & Marie It's Over!

Squabbling Osmonds break up Vegas act and may never work together again!

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After performing together for decades, Donny and Marie Osmond are calling it quits with their hit Las Vegas act because they’re fighting like cats and dogs, stunned insiders dish.

The brother and sister singing team announced they were ending their Sin City residency — which began in 2008 — in November.

Just days before the bombshell breakup, Donny, 61, went on TV and revealed he was furious with his kid sister because she spilled the beans about his secret identity as The Peacock on red-hot FOX competition shows The Masked Singer.

“Don’t even bring Marie’s name up!” fumed the betrayed star, who headlined with his sibling on a 1970s ABC variety series. “I was so mad. That’s the last time I’m going to trust Marie with a secret.”

He added if Marie were on the FOX singing contest, she’d wear a “monster mask!”