Video: Rob and Kristen Sing "Happy Birthday" With Katy Perry, Plus More Headlines!

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Robert Pattinson and Kristen Stewart continue their reunion tour! The couple was spotted outside a karaoke bar in LA earlier this week, and now they're singing "Happy Birthday" with Katy Perry - get the details, find out why mom-to-be Fergie "has no idea what's she doing," and discover which upcoming film is combining the comedic power of Will Ferrell and Kristen Wiig.
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