Every Famous Person on the face of the earth is in this video singing along with Bonnie McKee's "American Girl".

Here are few that I picked out:  Katy Perry, Ke$ha, Kathy Griffin, Macklemore, Joan Rivers, Karmin, George Takei, Adam Lambert, Carly Rae Jepsen, Jenny McCarthy, KISS, Jason Derulo, Jewel, Tommy Lee, Sirah, Taio Cruz, & Jane Lynch.  How many can you name?