Mariah Carey tweeted a photo of herself in the recording studio without any makeup on. This is definitely a first for the superstar! Then, on Thursday, the pop diva made her triumphant return to stage looking fab as she belted out several of her hits in NYC. Plus, Kristen Stewart stepped out of her comfort zone rocking some hot leather pants at Paris Fashion Week, and check out our favorite celeb TwitPics of the week. Let us know on Facebook or Twitter which photos are your fave -- and why!
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