In a preview of Thursday's Lip Sync Battle, the Teen Wolf star dons a buttoned-up plaid flannel, frayed shorts, Vans and a backwards hat to belt out Harvey Danger's '97 alt-rock hit "Flagpole Sitta."
"Fingertips have memories, mine can't forget the curves of your body / And when I feel a bit naughty, I run it up the flagpole and see who salutes but no one ever does," Posey, 24, sings, pacing back and forth, pumping up the crowd. "I'm not sick but I'm not well. And I'm so hot cause I'm in hell."
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His competitor Gigi Hadid, 20, can be seen singing along and dancing in the background next to host LL Cool J, and it's safe to say the model's own performance – a sizzling rendition of the Backstreet Boys' "Larger Than Life," leather catsuit and all – can certainly hold its own.
Posey and Hadid will go mic-to-mic on Lip Sync Battle Thursday at 10 p.m. ET on Spike.