Can you believe it's been 10 gleekin' years?!

That's right, Glee premiered 10 years ago on May 19, 2009, introducing us to stars like Lea Michele and Darren Criss, made being a theater nerd cool, and, most importantly, raised awareness for the LGBTQ community and arts education. And it did all of this while simultaneously making its rabid fanbase laugh and cry on a regular basis. 

At the height of its popularity, the Fox hit series, created by Ryan Murphy, Brad Falchuk and Ian Brennan, was a pop culture phenomenon, delivering record ratings, attracting an endless line-up of A-list guest stars and even breaking Elvis Presley's long-standing record for the most appearances on "Billboard's" Hot 100 chart.

It seemed like everyone was gleek, listening to the cast's catchy covers and quoting every biting one-line spit out by the eternally track-suited Sue Sylvester (Jane Lynch). 

But with the really high highs came some lows, including the devastating death of the show's leading man, and in-fighting amongst the cast as they grappled with their rapid rise to mega-fame, with some of them not even old enough to drink when they became household names. 

Glee cast 2009

Fox Network

Plus, some of the most beloved onscreen pairings were actually dating behind-the-scenes, blurring the lines between TV and reality for the fans.

So what did you (maybe) miss on Glee after it debuted 10 years ago, with New Directions immediately winning us over with their iconic cover of "Don't Stop Believin'"? We've compiled some of the series' surprising secrets and facts for you to enjoy along with your celebratory Slushie—just don't throw it on anyone—before tuning into E! News on May 17 at 7 p.m. for behind-the-scenes secrets straight from the cast...

Ryan Murphy, Glee Cast

Courtesy: Samsung Galaxy

Glee cast 2009

Fox Network

Dianna Agron, Glee

Twitter

Cory Monteith, Lea Michele, Glee, First Times

Adam Rose/FOX

Dave Grohl, The Foo Fighters

Chris Hyde/Getty Images

Jenna Ushkowitz, Kevin McHale, Glee

Mike Yarish/FOX

Cory Monteith, Chord Overstreet, Glee

FOX

Darren Criss, 2019 Golden Globes, Golden Globe Awards, Winners

Paul Drinkwater/NBCUniversal

Heather Morris, Glee

FOX via Getty Images

GLEE, Sarah Jessica Parker

Mike Yarish/FOX

Glee, Britney Spears, Heather Morris

Adam Rose/FOX

Glee, Chris Colfe, Cast

Carin Baer/FOX

Lea Michele, Chris Colfer

Jackson Lee/NPG.com

The Glee Project

Andrew Eccles/Oxygen

Glee, Season 6, Chris Colfer

Tommy Garcia/FOX

Neil Patrick Harris, Matthew Morrison, Glee

Michael Yarish/Fox

Naya Rivera

Angela Weiss/Getty Images for Race To Erase MS

Glee, The Quarterback Episode

Adam Rose/FOX

Lea Michele, Tattoo, Cory Monteith

Instagram

Becca Tobin, Lea Michele , Vanity Fair Young Hollywood

Joe Scarnici/Getty Images for Vanity Fair

For more exclusive memories and never-revealed-stories about Glee, watch E! News tonight at 7 p.m. for scoop straight from the cast as they look back on the show 10 years later...

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