Stars celebrated holidays of all kinds this week. Nicole Richie and Joel Madden went trick-or-treating, while Sofia Vergara took a vacation on set. Justin Bieber and Ryan Seacrest spread Christmas cheer, and Ashton Kutcher welcomed the arrival of a new company to Hollywood — click through to see all the pics, and don't forget to follow PopSugar on Twitter for exciting news and photos!
The Week's Most Fun and Funny Celebrity Twitter Pictures!
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