Pop superstar Michael Jackson will appear at the Grammy Awards on Sunday - but he won't be singing at the ceremony. Jackson was rumored to be attending the Los Angeles bash to promote a 25th anniversary re-release of his seminal album Thriller, and organizers were keen for the star to duet on hits from the LP with a number of contemporary performers, including Will.I.Am, Akon, Kanye West and Fergie.

But Jackson - who hasn't performed live in seven years - was reluctant to take on such a big project at short notice.

A source tells the New York Post, "Michael can't go along with that. He needs more time to rehearse new versions of the songs. And everything requires new choreography."

The Post reveals that Grammy producer Ken Ehrlich backed down and consented for Jackson to just appear onstage.

-Michael Jackson Pictures

(This news article provided by World Entertainment News Network)