But what we didn't know was just how much he loves his gig on the Golden Globe-nominated hit show.
Thankfully, he wrote a little ditty and produced a video to show his appreciation. Talk about the perfect holiday card!
The erstwhile Puck begins with a reenactment of getting the call that he scored the job, complete with a New Kids on the Block T-shirt! He makes sure to show off all his behind-the-scenes pals and gives a wink to some of his costars.
"Matt [Morrison]'s well cast, Lea [Michele] blows me away/I could read a scene with Dianna [Agron] every day," he croons. "Kevin [McHale] is hilarious, Amber [Riley]'s got soul/Chris [Colfer] is a great actor, Naya [Rivera]'s beautiful."
But it's the chorus that makes our knees knock most.
"There is no where I'd rather be than chillin' on Glee/And I wanna thank you for making me part of this family/It's a crazy world and we don't know where we will go/But I will be your friend when we get there."
We dare you to find a better definition for swoonworthy.