Ever since Rita Ora broke onto the scene, people have been comparing her to Rihanna not only musically, but on a physical level. So, we've decided to narrow it down to one of ladies' most dazzling attributes -- their smiles -- and ask all of you readers which songstress has the greatest grin.

Wow. Before we continue, can we just take a second to marvel at the beauty of Rihanna and Rita Ora? .... PHEW! OK, we're done now.

Rihanna's dazzling smile reminds us why we fell in love with her to begin with. The 'Where Have You Been' singer is such a gorgeous young woman, and her perfectly sculpted lips and blinding white teeth just further enhance her already beautiful face.

Meanwhile, 'How We Do (Party)' newcomer Rita Ora has the power to light up a room with her smile -- there's nothing fake about this girl's feel-good grin. Like Rihanna, her wonderfully straight choppers and ruby red lips only add to her already existent beauty.

In your opinion, which of these ladies has the best smile: Rihanna or Rita Ora? Cast your vote below!

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