I don't think anyone did. From what I've found, it's an original. But also, it wasn't written by Jessica. It was written and produced by Louis Biancaniello and Sam Watters. You can find that info here -
I Wanna Love You Forever - Wikipedia, the free encyclopedia
Yeah, so as far as I can tell, the words and music were done by Louis & Sam but performed by Jessica.
Also, the commercial single from I Wanna Love You Forever was released on the 28th of September, 1999...therefore, I'm pretty sure it was the original
