Justin Bieber unveils his "Believe Acoustic" cover.

+ Justin Bieber tweeted the album cover for Believe Acoustic, dropping Jan. 29. The cover lists two previously unreleased songs, "Yellow Raincoat" and "I Would." (MTV News)

+ Justin Bieber made headlines again this weekend when photos of him holding (what looks like) a marijuana joint surfaced on TMZ. Hours after the photos appeared online, Justin tweeted, "Everyday growing and learning. trying to be better. u get knocked down, u get up." (MTV News)

+ M.I.A.'s long-delayed fourth album, Matangi, may finally have a street date (we hope it holds). "It's due in April, which is Tamil new year -- April 15 -- and I'm still working on it," she said, adding, "At the moment, I've been told it's too positive. So we're having a bit of an issue at the label [Interscope]." (Rap-Up)

+ And speaking of April, Paramore's eponymous album drops April 9! In the meantime, the band tweeted a 57-second teaser (#moreplease) of their forthcoming single, "Now," which will be available on iTunes Jan. 22. (Neon Limelight)

+ Nicki Minaj is back on Twitter after a monthlong sabbatical, though this time she didn't leave on purpose. "I didn't really plan on leaving barbz! = ( just sorta happened...I learned a lot on my little sabbatical tho... so enlightening, so peaceful," she tweeted. (Rap-Up)

+ Meanwhile, Demi Lovato is taking a Twitter holiday. After a group of tweets about trust, communication, and friendship, she ended with, "Blehh. I really love my fans but I hate gossip sites... Gonna take a breather from twitter.. love you all!" (Idolator)

+ Jessica Simpson showed off her lovely baby bump and bodacious curves while in Hawaii. She and fiancé Eric Johnson announced on Christmas Day that they are expecting their second child. (E!)

Photo credit: @justinbieber