Stars were as social on Twitter as they were in real life this week. Justin Bieber dropped in on an affectionate Katy Perry and Russell Brand, while Jennifer Lopez worked her new clothing line. Eva Longoria made some puppy friends, and Jessica Simpson jetted off from a relaxing vacation in Mexico — click through to see all the pics, and don't forget to follow PopSugar on Twitter for exciting news and photos!
Jessica Simpson, Jennifer Lopez, Eva Longoria, and More in This Week's Fun and Funny Celebrity Twitter Pictures!
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