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+ Katy Perry hosts "SNL" this week, and hubby Russell Brand's playing coach: "Every day I call him and I'm like 'this happened' and he's like, 'I know what that means'... he's gotten me really prepared for this week, thankfully." Robyn's the musical guest. (MTV News)
+ Jay-Z will grace Carnegie Hall's stage in February, which will benefit United Way and the Shawn Carter Scholarship Foundation. "Any time I get a chance to expand and broaden the reach of hip-hop is a great thing for me on a personal level," says Jay. (MTV News)
+ Hilary Duff dishes on pregnancy, aggressive paparazzi and a possible move to Canada. Also, she says her baby son's spurring her back to music: "I don't want to waste this time because I want to get my voice in shape. He kicks me." (E!)
+ Watch Demi Lovato perform "Skyscraper" and Joe Jonas sing "See No More" at Q102 Jingle Ball in Philadelphia. (Just Jared Jr.)
+ Nicki Minaj turned 29 yesterday, and former tourmate Britney Spears sent her a video birthday greeting; Nicki sent one to Brit when she turned 30. (Neon Limelight)