Lyrics:

“Who’s That Girl?” is a song recorded by Hilary Duff for her third studio album Hilary Duff, released in 2004.
There were places we would go at midnight
There were secrets that nobody else would know
There's a reason, but I don't know why
I don't know why
I don't know why
I thought they all belonged to me

Who's that girl? Where's she from?
No, she can't be the one that you want
That has stolen my world
It's not real, it's not right
It's my day, it's my night
By the way, who's that girl livin' my life?
Oh no, livin' my life

Seems like everything's the same around me (Around me)
Then I look again and everything has changed
I'm not dreaming, so I don't know why
I don't know why
I don't know why
She's everywhere I wanna be

Who's that girl? Where's she from?
No, she can't be the one that you want
That has stolen my world (Stolen my world)
It's not real, it's not right
It's my day, it's my night
By the way, who's that girl livin' my life?

I'm the one who made you laugh
Who made you feel and made you sad
I'm not sorry
For what we did, for who we were
I'm not sorry, I'm not her

Who's that girl? Where's she from?
No, she can't be the one that you want
That has stolen my world (Stolen my world)
It's not real, it's not right
It's my day, it's my night
By the way, who's that girl livin' my life?
Oh no, livin' my life