A songwriter that's written hit songs for Katy Perry, Britney Spears, Ke$ha and MANY more is deciding to launch her own solo career. 

To help get it off the ground she made a few phone calls and invited a bunch of superstars to appear in her video. 

Bonnie McKee invited more than 20 stars to lip-synch to her song "American Girl." 

She ended up scoring Adam Lambert, Katy Perry, Ke$ha, Kiss (in full makeup), Carly Rae Jepsen, Macklemore and a lot more. 

Here's the video...