A high-octave note of congrats is definitely in order today (May 17) because "Glee" alum Heather Morris has finally said "I do" to her longtime beau Taylor Hubbell.

Morris, who had been dating Hubbell since high school, walked down the picture-perfect outdoor aisle on Saturday, in a stunning backless wedding gown, and shared her first dance as Heather Hubbell -- can we called her HSquared now? -- to the tune of "Unchained Melody."

We know all of this because people in attendance were actually allowed to live-Instagram the whole thing, which, hooray for social media privileges!

Yep, you can witness the first dance -- and all the wedding party's sweet sway-along technique -- for yourself.

And thanks to this virtual open access to the big day, we also learned that Heather, who portrayed the sometimes-OK-actually-all-the-time ditzy Brittany S. Pierce, had a few familiar faces on her guest list, including a bunch of her fellow "Glee" alums.

Here, the happy couple was joined by Vanessa Lengies, who played Sugar Motta on the show.

Then, Naya Rivera (who played Morris' wifey-poo onscreen) was spotted with her IRL hubby, Ryan Dorsey.

And check out Jenna Ushkowitz, a.k.a. Tina Cohen-Chang, styling and profiling in those shades.

Plus, Kevin McHale!

From the looks of things, everyone was jamming pretty hard-core at this splendid shindig.

Spot anyone else you know in the crowd there?

It's all so beautiful. We'll never stop believing in these kids.