He said it was meant for the Burlesque soundtrack. He didn’t say the song’s name.. but Jimmy was asking him about his fellow judges in The Voice and he asked him if he had known Christina prior. and he said “No, we just did a song a while ago that was meant for the Burlesque soundtrack but it didn’t end up making the cut”. So it was for Burlesque…
Source: .Zae. via LD
