Plus, vote: who do YOU think performs Joan Jett’s classic better — Miley or K-Stew?

Miley Cyrus must have taken Kristen Stewart‘s performance as Joan Jett in the The Runaways as a challenge, because she performed Joan’s hit “I Love Rock ‘n’ Roll” on Jan. 22 at the So Undercover wrap party to belt out Joan’s most famous song, “I Love Rock ‘n’ Roll.” Groovy 7 performed with Miley, and Jeremy Piven backed them on the drums!

Watch both Miley and Kristen‘s covers and vote: Who do you think rocks Joan’s hit better?

- Lindsey DiMattina