Gaga and Beyonce appear in 'Powerful Women' top 10

Lady Gaga and Beyonce Knowles have been named in the top ten of the 2010 Forbes Most Powerful Women In The World list.

The pop stars – who collaborated on the single ‘Telephone’ – came seventh and ninth respectively joining a host of political leaders including US Secretary of State Hilary Clinton and German Chancellor Angela Merkel in the poll.