Oprah didn't get filthy rich by ignoring golden opportunities ... which could explain why she's riding Beyonce's lemonade bandwagon straight to the bank.
O recently made a move to expand merchandising rights of her personal "Oprah's" brand to include bottled water, energy drinks, coconut water ... and lemonade.
Always the savvy entrepreneur, Oprah filed the docs -- obtained by TMZ -- a few weeks after Bey's "Lemonade" album became a smash hit.
No word on when the beverages will roll out ... but Oprah's neighbors in Montecito better prepare for the most expensive lemonade stand of all time.
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