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Julianne Hough and "Vampire Diaries" star  Nina Dobrev are two of the hottest chicks in Hollywood ... and both were at Selena Gomez's 21st bday party ... but the question is, who's hotter?

Nina Instagrammed the pic Saturday night mid-celebration of she and Hough dressed as gypsies -- per Selena's theme -- and exposing their mid-drifts ... making everyone with eyes super happy.

So we gotta ask ...