In this edition of Tweet Beat, we say goodbye to a disco great, Katy Perry's movie poster looks like a cover of Sweet…

Singer Donna Summer died today at the age of 63; she'd been battling breast cancer, though sources say she was trying…

[Oslo, December 13. Image via Bauer-Griffin]

• Whoa. Robert Rodriguez and Rose McGowan are dunzo. She was supposed to star in his remake of Barbarella, but studio…