Just when you think she can't get any cooler, she does. 

Katy Perry's new song/video "Last Friday Night" is hilarious...and features, the famous "Friday" singer that everyone loves to hate - Rebecca Black! 

The video also features one of Glee's favorites, Hanson, and Kenny G! :) 

Check it out! 

Unfortunately - there's no embedding yet so click HERE for the video!