Congratulations to the Backstreet Boys, whose ‘In a World Like This’ has dominated the Pop Clash for four straight weeks, earning a place in the Pop Clash Hall of Fame! Bring on the contenders in the next bout ... Ariana Grande and Jason Derulo!

Ladies first: Ariana's 'Almost Is Never Enough,' which features rumored boyfriend Nathan Sykes of the Wanted, is a slow jam centered on love lost. Its yearning lyrics include the heartbreaking lines, "If I would have known that you wanted me / The way I wanted you / Then maybe we wouldn't be two worlds apart."

While equally romantic, Jason's 'Marry Me' is pretty much the polar opposite thematically. It's about a love gone right -- right on up to the altar with his lady love Jordin Sparks, if Jason has his way! Check out these tender words: "How many girls in the world could make me feel like this? / Baby I don't ever plan to find out / The more I look, the more I find the reasons why / You're the love of my life."

So what's it going to be, PopCrushers -- lost love or forever love? Vote for Ariana Grande's 'Almost Is Never Enough' or Jason Derulo's 'Marry Me' below! You can vote once per hour until the poll closes at 3PM ET on Sept. 9.

Watch the Ariana Grande 'Almost Is Never Enough' Video

Listen to Jason Derulo, 'Marry Me' Audio

Rules of Pop Clash: The artist and song with the most votes wins, and the winner goes on to face a different challenger the following week. If an artist wins four weeks in a row, they will be retired into the Pop Clash Hall of Fame in order to give others a chance to compete.

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