Gotta love Gwyneth!

She's been one of my favorite Glee guest stars of all time, and last night Hollie Holiday A.K.A Gwyneth Paltrow returned to the set for their 100th episode!

Did you watch?

 

Did you love?

Well... in case you missed it - here's her super fun take on the infectious song that will now be stuck in your head all day:  HAPPY!