Oprah Winfrey made $45 million Monday ... off of one stock.
Oprah announced this morning she bought 10% of the outstanding shares of Weight Watchers -- a $43.2 million investment.
The stock soared from $6.79 Monday AM to $13.92 at the close of trading, grossing her a cool $45 mil.
The announcement Oprah was investing in the company made investors go crazy ... the volume of shares traded was 70 times more than normal.
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