Lots of our favorite celebrities were busy tweeting away this week sharing pics of their family, friends, and pets as Halloween celebrations got underway. Nicole Richie sipped an early morning beverage with Ryan Seacrest while Lady Gaga spread peace with Sean Lennon. Sofia Vergara got into character and Kim Kardashian chilled with her nephew — click through to see all the pics, and don't forget to follow us on Twitter for exciting news and photos!
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