Jason Derulo performs on 'American Idol'.

Jason Derulo bounced back from his neck to perform on this evening’s episode of ‘American Idol’. Delivering a rendition of a new song, ‘Undefeated’, the auto-tune endorser shimmied across the stage while being supported by his new girlfriend, Jordin Sparks.

‘Undefeated’ is brought to you by Coca Cola, the company which helped Derulo craft the song and proud a sponsor of bad singing. Watch Derulo on ‘American Idol’ below:

Ironically, Derulo was defeated by his own vocal cords during this performance. His dancing was amazing but his singing was off-key and terribly strained; a fact that the judges faces indicated at the end. Hey, at least he still has Sparks’ affection and a free bottle of Coca Cola.

Listen to the studio version of ‘Undefeated’ below:

Thoughts?