This is my first tab ever... but I just love this song so I figured I'd share it 
with you. Hope it's right... Works for me. Enjoy!

One Day
by Kelly Clarkson
tabbed by: DocMartens

Capo 4

Intro: C Em (x 2)

C                     Em 
You don't know how you shine 
        C
I guess no one told you, 
                 Em    
So let me be the first to show how I 
C                      Em   
Love your eyes when you smile
        C                Em
Can't resist you even when I try 

Am     Em         G6 G
One day you'll see 
Am     Em     G6        G (x2)
One day you'll believe me 

C                     Em   
I don't know why they laugh
       C                              Em                 C
I won't ever understand foolish hearts and careless hands 
                         Em
I'm not like the rest of them 
        C              Em
I'll be here forever 

Til my last breath 

Am      Em       G6  G
 One day you'll see 
Am      Em     G6        G 
 One day you'll believe me
Am      Em        G6  G  
 One day you'll know 
Am      Em       G6      G    
 One day I won't have to show you 

C                             Em 
All I know is that I've found what I've been looking for 
C                                     Em 
Held you once, and took a chance, and asked for a little more 
Am             Em               G6            G    
You don't know how you light up every room or how you shine 
Am             Em
I guess no one ever told you
G 
If you don't mind 


Am      Em       G6  G
 One day you'll see 
Am      Em     G6        G 
 One day you'll believe me
Am      Em        G6  G  
 One day you'll know 
Am      Em       G6      G     C
 One day I won't have to show you