Mariah Carey

Chart topping pop divas Fergie and Rihanna are now topping something else - PEOPLE's Best Dressed List. Known for rocking the charts with their respective hits "Party People" and "Disturbia," Fergie and Rihanna have donned some of the hottest gear in 2008.   "I don't like to throw anything away," says Fergie when asked about her "closets".   Actresses Kate Hudson, Anne Hathaway, Gwyneth Paltrow, Charlize Theron, Eva Mendes, and Sarah Jessica Parker join Fergie, Rihanna and Heidi Klum.   Rounding out the top 10 -- and making a campaign statement for fashion -- was Michelle Obama, wife of Democratic presidential candidate Barack Obama, who was given high marks for a look that was "classic and confident."   "She has a look. She works it with confidence, and she knows what looks good on her," said People's Style Editor Clarissa Cruz.   But Obama played down the notion that her sense of style might be anything close to couture, telling People: "Some of my favorite summer dresses are from Gap and H&M."   "The thing they all have in common is that they all had a great year, stuck to their own personal style and stayed true to that," said Cruz.