I Am...Sasha Fierce is disc two of Beyonce's new double album, I Am... which was released on November 18, 2008. The first disc is titled I Am...Beyonce. Sasha Fierce is the the alter ego of Beyonce.

"Single Ladies (Put a Ring on It)" was the first single released from the disc. It was released to radio stations on October 8, 2008.New York Magazine: Beyonce’s Split Personalities to Release Double Album...(October 15, 2008)

For the release of her third studio album, Knowles has revealed that the second half of the disc was recorded and performed as her alter ego, Sasha Fierce. In the singer's own words: "Sasha Fierce is the fun, more sensual, more aggressive, more outspoken side and more glamorous side that comes out when I'm working and when I'm on the stage." —Beyonce KnowlesTelegraph: Beyonce renames herself Sasha Fierce (October 23, 2008)

1. "Single Ladies (Put a Ring on It)"
2. "Radio"
3. "Diva"
4. "Sweet Dreams"
5. "Video Phone"
6. "Hello"
7. "Ego"
8. "Scared of Lonely"
9. "Why Don't You Love Me?"

• imeem: I Am...Sasha Fierce