And ALL the celebs in Hollywood.  She has a lot of friends!!!

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The music video features Katy Perry, Ke$ha, Carly Rae Jepsen, Macklemore, Becky G, Lance Bass, Karmin, Jason Derulo, Taio Cruz, Adam Lambert, Sofi, Sirah, Nicole Scherzinger, Jewel, Joan Rivers, Kelly Osbourne, Jenny McCarthy, Kathy Griffin, George Takei, KISS, Tommy Lee, Jane Lynch, and more!

http://www.youtube.com/watch?v=my9QAIrc9ak