Welcome back to the Tournament of THG , where fans vote on the most popular star of 2011! The concept is simple: Pick your favorite of the two stars in each poll. Done. The quarterfinal round begins tomorrow, so this is your last chance to cast your virtual ballots for all eight first round contests. So far, some are closer than others. Katy Perry, Lady Gaga, Justin Bieber and the Middleton girls have commanding leads, while Demi Lovato, Miley Cyrus and Robert Pattinson are ahead only by a whisker. Who will advance to the next round? VOTE below (and after the jump)!

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Tournament of THG: Last Chance to Vote in All First Round Matchups!