You may have just heard of Bonnie McKee, but she's been around the music business for a long time.  She has written or co-written some of the biggest songs in the last 5 to 10 years.  For example,  'California Girls,' 'Teenage Dream,' 'Last Friday Night,' 'Part of Me,' and 'Wide Awake' for Katy Perry.  McKee also co-wrote 'Dynamite' by Taio Cruz, which became the second best-selling song by a British artist in the digital era.

She released a lip dub video a couple months ago that went viral.  You can check out that video here.  She called on some of her A-list colleagues to participate.  See how many celebs you can spot.