Lady Gaga, Beyonce Knowles Among the Most Powerful Women in the World

 Singer Beyonce arrives at Billboard's 4th Annual Women In Music event at The Pierre Hotel on October 2, 2009 in New York City

 Billboard Magazine Editor and Cheif Bill Werde and musician Lady Gaga at Billboard's 4th Annual Women In Music event at The Pierre Hotel on October 2, 2009 in New York City

Congratulations to Lady Gaga and Beyonce! The pop stars, who worked together on the single "Telephone," came seventh and ninth respectively in a poll of the Most Powerful Women in the World conducted by Forbes.

First Lady Michelle Obama took the number one spot.

According to Forbes, this year’s index was based more on creative influence and entrepreneurship, leading to the inclusion of Beyonce and Gaga.

Moira Forbes, vice-president and publisher of ForbesWoman, insists the people featured in the top 100 had affected billions of people.

She said: “The women on our list, through their respective realms of power and influence, are shaping many of the agenda setting conversations of our day. They have built companies and brands, sometimes by non-traditional means, and they have broken through gender barriers in areas of commerce, politics, sports and media and cultural zeitgeist, and thereby affecting the lives of millions, sometimes billions of people.”

Other entertainers on the list include talk show hosts Oprah Winfrey and Ellen DeGeneres, who came third and tenth respectively.