It's Kate as in Keyyyyt.

zetling:

Poker Face - Glee cast

Shelby-Rachel (Idina Menzel and Lea Michele) duet in Glee’s next-next week’s episode. Mmmm, then next week’s episode is about Rachel finding her mom. Sooooo, Shelby is Rachel’s mom? HAHAHA, insane theory.  

That’s not an insane theory. They do look alike! This might be my favorite episode of the season.