Mariah Carey's 'Memoirs' Album Delayed Again
James Devaney WireImage

Some of the most highly-anticipated albums of the summer have been delayed, including Mariah Carey's "Memoirs of An imperfect Angel," Sean "Diddy" Combs' "Last Train To Paris" and Lil Wayne's proprter rock and roll album "Rebirth."

Carey's "Memoirs," first slated for an August 25th release via Island Def Jam will now be available on September 15th according to the Universal Music Group business-to-business website. Carey's new single, "Obsessed," is at No. 11 on the Billboard Hot 100 this week.

Combs said via a video interview with MTV News release last week that his project's been delayed partially because it's "Jay-Z time and Drake time -- enjoy those guys. But the 'Train' is coming, baby," he warns. "Get your ticket, you don't want to be left out."

Lil Wayne's label publicist confirmed to Billboard.com that his release date has also been moved, although a new date hasn't been scheduled yet. "Rebirth" was last slated for a June 23rd street date.

In addition, Amerie's long-awaited return, "In Love & War," which was originally slated for an August 11th release, will now be available on September 8th. Lead single, "Why R U," reaches No. 62 on the Hot R&B/Hip-Hop Songs chart this week.