Domestic diva Martha Stewart is furious with Duchess Meghan Markle for daring to infringe on her territory and is firing back at the ambitious royal castoff, RadarOnline.com can reveal.

The 83-year-old media mogul didn't mince words when she took aim at 43-year-old Markle's efforts to become a lifestyle guru via the Netflix show With Love, Meghan – which ranked a pitiful 383rd and has drawn just 5.3 million views since its March debut. Article continues below advertisement

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"Meghan, I don't really know very well. I hope she knows what she's talking about," she said. "Authenticity, to me, is everything, and to be authentic and knowledgeable about your subject matter is ex

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