Instead of a battle of the sexes, it's a battle of the sexpots! Miley Cyrus is up against Rihanna in Round 1 of the 2013 PopCrush Homecoming Court. Which grill-rocking minx should nab the title of Homecoming Queen?

Miley Cyrus isn't even legal drinking age, but she's hot on Rihanna's trail in terms of hard partying and provocative posing. Cyrus reinvented her entire image, going first from 'Hannah Montana' to rocker to hippie chick to her new "urban" persona. Whether she's rocking a onesie or even less than that, she always looks hot and carries herself with confidence -- and she's got a killer set of pipes. She wants to shock her way on to the Homecoming Court, and based on the sales of her singles like 'Wrecking Ball' and 'We Can't Stop,' it's working!

As for Rihanna, the good girl gone bad is more badass than truly rotten. Whether it's flaunting her insane bod in magazine spreads or her own prolific Instagram, RiRi not only shows her skin, but her spirit. The singer's been increasingly open about everything from her relationship with Chris Brown to her mourning of her grandmother, and she has a heartfelt love for her Navy that rivals that of Cyrus' love of her Smilers ... and Kanye West signed off on her before he gave his nod to Cyrus!

So which superstar is it going to be for Homecoming Queen -- Rihanna or Miley? You can vote once an hour until the polls close at 3PM ET on Oct. 23.