Sneak Peek: Glee???s Troubletones Perform an Adele Mash-Up (omg!)

The Brit is back on Tuesday's Glee! While Adele's songs have been covered on the show before, The Troubletones' performance may very well be the best yet.?Santana, (Naya Rivera), Mercedes (Amber Riley), Brittany (Heather Morris) and the rest of the newly formed girl group take on a mash-up of "Rumour Has It" and "Someone Like You." The performance is also the show's 300th musical number.

Harry Potter, Glee lead People's Choice Awards nominations

Check out the sneak peek:

The Glee episode titled "Mash Off" airs Tuesday at 8/7c on Fox.

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