Aylin Bayramoglu, Ali Stroker, Blake Jenner

This Tuesday marks the season finale of The Glee Project (10/9c on Oxygen), which means Aylin, Ali and Blake will not only have to bring it for Ryan Murphy and the rest of the judges, but also for final Glee Project mentor, Golden Globe winner Chris Colfer. Luckily, Glee casting director Robert Ulrich has called in some reinforcements.

"To really make sure you have a killer finale homework performance, I've arranged for you to work with some amazing backup vocalists," he tells the final three before the eliminated Season 2 contestants -- including Aylin's former real-life love interest, Charlie -- come strolling through. And Aylin and Charlie don't waste any time giving each other a proper hello.

Watch more videos from The Glee Project

Get a sneak peek at their sweet reunion here:

Plus: Get an early look at the final music video of the season, featuring many familiar faces and a surprise appearance from one of the Season 1 winners. Can you guess who?:

The Glee Project season finale airs Tuesday at 10/9c on Oxygen. Who do you think will win?