NEW YORK (Reuters) - Singer Taylor Swift edged out teen heart-throb Justin Bieber as the highest-earning celebrity under 30, taking in $57 million, as women dominated the top spots on a list released by Forbes.com on Thursday. Bieber, who brought in an estimated $55 million, was the only male among the top five earners, who included Rihanna at No. 3 with $53 million, followed by Lady Gaga and Katy Perry. "We are seeing a convergence of these talented women who know how to work the system," said Dorothy Pomerantz, the Los Angeles bureau chief for Forbes. ...