Constantine Maroulis Is ‘Unchained’ on Tonight’s ‘American Idol’

Season 4 alum Constantine Maroulis -- known for being one of the best rockers in 'American Idol' history -- was back for a performance on tonight's episode, belting out the classic, mournful ballad, 'Unchained Melody.' With his leather jacket, fingerless leather gloves, open white t-shirt and his cascade of curls, Maroulis looked every inch the rock star. He even affixed a scarf to his mic stand, a la Steven Tyler.

While Maroulis started off a little flat, he erupted by the middle of the song, reminding us why he was invited back to sing tonight. Maroulis -- a Tony nominee (thanks to his work in 'Rock of Ages') -- is proof that you don't need to win the 'Idol' crown in order to go on to have a successful career. He also showed a picture of his beautiful new daughter!

Looks like life is kind to Constantine Maroulis, who was appreciative about being able to come back to 'Idol.'

Watch Constantine Maroulis Perform 'Unchained Melody'