Mariah Carey has already began work on her follow-up to last year’s, E=MC². Her 12th studio album, is set to be titled Memoirs of An Imperfect Angel, she revealed via her Twitter page.

“Bcuz I Love U, I want u to be the first to know the title of my new album Memoirs of An Imperfect Angel. It’s very personal & dedicated to u,” she tweeted.

Carey, 39, also confirmed that this time around, she is collaborating with Timbaland, and not steering to clear of past formulas. She’s still cranking out tracks with Tricky Stewart and The Dream, who were responsible for her last #1 single, “Touch My Body,” as well as Jermaine Dupri and Bryan-Michael Cox. The album is set to hit stores at the end of this year.

Several of Michael Jackson’s anticipated “This Is It” London concert dates were postponed on Wednesday afternoon.

An email issued through concert organizers revealed that Jackson’s July 8 gig has been rescheduled for July 13. Three other July dates, however, are now not expected to take place until March 2010. Read the release below:

“Due to the sheer magnitude of the “This Is It” concerts at the O2 Arena promoters and producers AEG Live and Kenny Ortega, Michael’s directorial partner and creative collaborator have elected to move back a few of the opening shows in order to meet the challenges presented by such a massive and technically complex show.

We wanted to ensure that all of Michael’s fans attending the concerts get the same quality in staging and level of entertainment. It is AEG Live’s sincere hope that those lucky enough to have purchased tickets will have enough time to change their personal schedules and travel plans if they are coming from outside of London.”

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