First, Sarah Silverman made a hilarious music video for boyfriend Jimmy Kimmel called "I'm F***ing Matt Damon." Then Kimmel countered with a response called "I'm F***ing Ben Affleck," which upped the ante and became a "We Are The World" spoof, complete with cameos by Brad Pitt, Robin Williams, Josh Groban, Cameron Diaz, Huey Lewis, and many more. Both videos became huge YouTube hits.
All the guest celebrities Kimmel gathered to sing an idiotic and...
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