WASHINGTON — Jill Biden’s ex-spokesman Monday revealed how “mean girls” ruled a White House “cult” that once shielded the former first lady and her husband — griping that the “Biden Bubble was full of bullies.’’

Former Jill Biden rep Michael LaRosa, in a scathing Fox News op-ed , credited former Vice President Kamala Harris for exposing the bullying tactics in her new book, which is set to be released Tuesday.

“Harris’s forthcoming book, according to recently released excerpts, says what insiders whispered for years: the Biden bubble was full of bullies,” LaRosa wrote — adding that the veep was “finally saying the quiet part out loud.

“Inside the White House, the Regina Georges of Biden’s circle ruled like mean girls and policed loyalty,” he said, referring to actress Rachael McAdam

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