Chennai-born CEO of PepsiCo, Indra Nooyi, has been named the world's most powerful businesswoman by Fortune magazine, ahead of people like Oprah Winfrey and eBay chief Meg Whitman.The latest feat follows a similar honour bestowed upon Nooyi by another business publication Forbes, which had also named her as the world's most powerful woman soon after she was named the new PepsiCo CEO.CNN-Time Warner Group business magazine Fortune today said Nooyi tops its ninth annual list of '50 Most Powerful Women in Business', which would appear in the latest issue of the magazine hitting news stands on October 9.Padmasree Warrier, the CTO at US-based telecom giant Motorola and another woman of Indian origin, has also been named among the four "rising stars" in the same issue of Fortune, who could find place in the next list of powerful businesswoman of the world.Nooyi, who took over the reins at PepsiCo yesterday, has moved up ten slots from the 11th position in 2005. She replaces eBay CEO and President Meg Whitman from the numero uno position, a position Whitman occupied for the past two years.