Which Reality Star Is a Former Dance Champion — And Rocked This Neon, Sequined Costume? (PHOTO)

This Jersey Shore guidette has been dancing since she was a little girl, and as part of her campaign to get on Dancing With the Stars, Deena Nicole Instagrammed this adorable throwback pic.

Though she doesn’t wear rainbow one-piece outfits anymore, we bet she could pull off this wacky costume today!

Did you know it was Deena, or did we stump you? Tell us below, and then click here to play more Jersey Shore “Guess Who?”