Check out these 'X Factor' judges all decked out for prom! Doesn't vintage Britney Spears just look darling in that super '90s prom dress? And prom princess Demi Lovato is very va-va voom flashing her gams in that red gown! With prom season (and PopCrush's poll for Prom King and Queen 2013) in full swing, we're taking votes on which pop singer looked the best at her prom. Brit or Demi?

Way back when '...Baby One More Time' was making its rounds on the radio, Britney Spears hit up the prom in McComb, Miss., to dance the night away in her bright and sparkly prom dress (you can see a larger picture below). Young Spears opted for a classy updo with bangs, and her red-orange halter dress boasted some bling on the bodice and throughout the neckline. Don't you just <3 Baby Brit? She looks like a regular Southern bell on her way to the prom.

Meanwhile, Demi Lovato didn't attend her own prom, as the 'Heart Attack' hit maker was home schooled the latter half of high school years. But she still got to experience the big night with her BFF Nolan, who brought Demi as his date to his H.S. dance. Lucky guy! And thank the Lord that red gown didn't go to waste, because Lovato is absolutely fabulous in this prom ensemble. We also love how much fun she and Nolan look to be having in this classic, "pose by the limo" shot.

Which singer do you think was the envy of the dance? Vote Brit or Demi for best prom picture below!

Britney Spears Prom
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Demi Lovato Prom
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