Leona Lewis could join Michael Jackson at his comeback shows in London, it's been reported.

The former X Factor winner is being considered for a duet of Jackson's hit 'Scream', which he originally sang with his sister, Janet.

"Michael has a list of singers he feels could do Janet justice - and Leona is top," a source told The Sun newspaper.

"She's massive all around the world and he feels this duet would give both their careers an even bigger boost."

A number of artists, including Britney Spears and Justin Timberlake, have already been linked to Jackson's shows at the O2 Arena, which begin on July 8th.

The singer will perform to over a million people during his 50-date London residency.

Jackson, now 50, has not performed a full concert since he was cleared of child molestation charges in 2005. His last full tour, entitled HIStory, took place in 1996 and '97.

(by Jason Gregory)