Last night's TrevorLIVE event was pretty much the best thing ever, not only because it benefitted such an important cause but also because it was just about as chockfull of Glee stars as an actual Glee episode. And our favorite part of the whole thing might have been watching Amber Riley's (Mercedes) Glee co-stars react to her rehearsal for the event.

TrevorLIVE took place on December 8 and is a semi-annual event to benefit The Trevor Project, which provides crisis intervention and suicide prevention to LGBTQ youth. Among the Glee stars who performed at the star-studded event were Darren Criss (Blaine), Mark Salling (Puck), Amber, and current Season 5 guest star Adam Lambert (Starchild). 

Plenty of other Glee faces were onhand to make appearances, including — deep breath! — Naya Rivera (Santana), Chris Colfer (Kurt), Blake Jenner (Ryder), Melissa Benoist (Marley), Jacob Artist (Jake), Becca Tobin (Kitty), Alex Newell (Unique), Harry Shum Jr. (Mike), and Dot-Marie Jones (Beiste). Now that is a lot of Glee stars in one room. 

There was also another Glee star present, even though he wasn't onstage. Indeed, Kevin McHale (Artie) tweeted afterward:

Perhaps even better than getting to see the actual show is getting to see how Amber's Glee pals reacted during her rehearsal beforehand. Click here to see the amazing video, as Darren, Kevin, Mark, and Alex are all clearly moved by Amber's voice.

We love when the Glee family all supports each other, especially for charitable causes!

Sources: Kevin McHale on InstagramGlee on Tumblr