Somebody that I used to know.

When "Glee" returns after its winter hiatus next week, viewers, and Kurt (Chris Colfer), will meet Blaine's (Darren Criss) brother Cooper, played by Matt Bomer. Take a look at the behind the scenes action of the brothers performing together.

For more on what's to come, check out the Glee Spoiler Video: Countdown to Graduation.

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- Lori Wilson