American Idol winner Jordin Sparks was delighted to record a duet with Chris Brown recently - because she used to have a poster of the R'n'B hunk on her bedroom wall. The pair's No Air duet features on her upcoming eponymous debut album, and Sparks admits she never thought she'd get to sing with her ideal man. She says, "I have the biggest crush on him (Brown). "Two years ago, I wanted nothing but his CD for Christmas. It never came out of my player, and his poster is still on my wall. "I was dreaming that I could sing with him and now I did." And Sparks admits she's secretly hoping Brown has taken a shine to her. She adds, "If it ever came down to it, if he asked me out, I would say yes."