It was a fun week on social media, with celebrities dressing up, goofing off, and getting into costume for the cameras. Mariah Carey discovered her dog's new favorite snack, while Joe Manganiello traded his signature six-pack abs for a fake beer belly. Simon Cowell and Demi Lovato got silly on the set of The X Factor, and we got a surprising glimpse of what Brooklyn Decker would look like as a dude.
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