Behind-The-Scenes of 'Carrie's' Big Birthday Ep

I've got good news for fans of Walt and Bennet who were worried their love couldn't progress until Walt was legal: he turns 18 this Friday and ETonline scored a sneak peek at the making of The Carrie Diaries' all-new episode, titled Express Yourself!

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To mark the occasion, Walt, Bennet, Carrie, Mouse, Donna and Samantha attend an important event in the life of every east coast kid: their first Z100 concert! Playing this particular stage is American Authors! "It's a special treat," AnnaSophia Robb says of having the Brooklyn-based band on the show to perform In A Big Country by Big Country.

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Of covering the iconic song, the band says in the sneak peek, "We love taking songs that we already love and changing them around and putting our own flavor to it. We threw some synths in there and made it our own." Watch to see if you think American Authors have done a good job "updating" the track!

The Carrie Diaries airs Fridays at 8 p.m. on The CW.