Rihanna and Ariana Grande are facing off in the Semi-Finals for the Hottest Star of 2014! Rihanna barely took the lead on Taylor Swift in Round 1, earning 50.12% of the votes to Taylor's 49.88%. It was a close call between Ariana and Little Mix, too, with Ariana winning the round with 50.05% of the votes. So close! Now it's down to Rihanna and Ariana, but only one will make it through to the next round. Who will you be voting for?

Rihanna has been dominating the radio for nearly a decade now with her unforgettable hits, and the bad girl of pop didn't let that reign up in 2014. The Barbadian star took home the Artist of the Year award at the 2014 iHeartRadio Music Awards for her haunting collab with Eminem on ‘The Monster,’ and she'll be hitting the stage with the rapper this summer on the highly-anticipated Monster Tour. If her impressive discography weren’t enough to set her apart from the rest, her daring and unique fashion choices from the last year certainly branded her as the one and only RiRi. Who else could pull off a completely see-through dress?

Ariana Grande may be relatively new to the music scene, but she is taking it and making it her own! Her chart-topper ‘Problem’ made music history, earning the titles of fourth-largest debut week for a woman and biggest-ever debut for an artist under 21. Pretty impressive, considering ‘Yours Truly’ is the star’s first studio album. Between an intense promo tour for her LP, filming the music videos to go along with her hits and working on reviving the classic TV show ‘TRL,’ Ariana is one busy girl. Oh, and don't forget, you can expect her sophomore album out this fall or winter! There’s no doubt about it — this is Ariana’s year!

So who will it be for the Hottest Star of 2014? Send in your votes for Rihanna or Ariana Grande up to once per hour until the poll closes at 12PM on Monday, July 7. Rihanna Navy, Arianators, get to voting! Your favorite pop star will move on to the final round!