What song is this chorus from? Props for answer!

Baby,you light up my world like nobody else
The way that te flip your hair gets me overwhelmed
But when te smile at the ground it ain't hard to tell,
te don't know,oh oh,you don't know your beautiful.
If only te saw what I could see,
You'd understand why I want te so desperatly
Right now I'm looking at te and I can't believe,
te don't know,oh oh,you don't know your beautiful,oh oh,
But that's what makes te beautiful.

5 props for the right answer.