Crazy Ex-Girlfriend star Rachel Bloom is perfect for Lip Sync Battle. She's a true-blue theater kid, and she will commit fully to putting on a musical. She's also lacks vanity and is willing to make herself look uncool if it serves the performance. And what's less cool than acne?

That's right — on Thursday's episode of Lip Sync Battle, Bloom takes on the character of a band geek to perform Katy Perry's "Teenage Dream." Unlike in the song, not everyone wore skintight jeans in high school. Some people wore ill-fitting, sweaty, itchy wool suits that exacerbated their pre-existing skin problems. Check out a sneak peek above.

Rachel Bloom, <em>Lip Sync Battle</em>Rachel Bloom, Lip Sync Battle

Bloom will go up against scarily intense actor Michael Shannon on this week's Lip Sync Battle, which airs Thursdays at 10/9c on Spike.