EXCLUSIVE 'Glee' Sneak Peek: Celebrate the 700th Song and Brittana's Engagement!

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What the world needs now is Brittana, sweet Brittana.

Get ready to celebrate, Gleeks because we have two very special occasions in this week's exclusive sneak peek. After nearly six season of shimmies, shakes and sweet lady kisses, it's time to say congratulations to the Glee cast for their 700th song, and to Brittany (Heather Morris) and Santana (Naya Rivera) on their engagement.

"We're singing for Santana and Brittany, giving them a little love," Lea Michele says of the show's landmark musical number, "What the World Needs Now," by Burt Bacharach. "At the same time [we're] inviting ourselves to their wedding," Becca Tobin adds.

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"I have some news," Brittany spills with a big smile to her parents played by Jennifer Coolidge and Ken Jeong. "It's great — Santana and I are getting married!" (Cue the confused cheers of Pierce family excitement.) "Who is Santana?!" Brittany's dad excitedly exclaims.

Take a look at our exclusive first look above to see Amber Riley's grand return back to McKinley and the awkward love triangle between Mercedes, Rachel and Sam. Plus, watch Lea Michele get adorably teary-eyed when she looks back on Glee's musical legacy!

Glee airs Fridays at 9 p.m. on Fox.

What has been your favorite Glee song of all time? Are you excited for Brittany and Santana's engagement? Share your thoughts with @LeanneAguilera using #ETNow!

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