"She's the One" is a song by World Party, written by Karl Wallinger. In 1999 it was covered by Robbie Williams and released as a double A-side single with "It's Only Us". It was the fourth single from I've Been Expecting You. The song became Williams' second number-one single in the United Kingdom.
I was her, she was me
We were one, we were free
And if there's somebody calling me on
She's the one