This is quite simple, four chords repeated throughout the song. If you want easier 
chords; play with capo:4 and the chords G - D - Bm - A   

No capo
Intro: B ? F# - D#m -C#

B             F#
Stopped in my tracks
D#m            C#
Caught in her eyes
        B               F#
And my heart?s beating fast
             D#m                   C#
And all that chemo was this corny lie
  B                  F#
I hope that you know CPR
        D#m                      C#
?Cause girl you take my breath away
       B                          F#
No, I can?t believe that I just said that
D#m                     C#
What I really meant to say


           B                   F#
Is that I know that smile has broken a couple hearts
D#m              C#
You?re used to always getting what you want
B               F#                              D#m
Drop dead beautiful, knows how to knock them down
          C#
Oh girl, oh girl, check you out

  B                   F#
Yeah, that smile has broken a couple hearts
D#m              C#
You?re used to always getting what you want
B               F#                              D#m
Drop dead beautiful, knows how to knock them down
          C#
Oh girl, oh girl, check you out


    B          F#
I tried to relax
          D#m               C#
But my tongue kept getting tied
     B         F#
The star and land
        D#m                      C#
But nothing seemed to come out right
B                         F#
Girl, I know you must be tired
                    D#m                         C#
?Cause you?ve been running through my mind all day
                 B                         F#
Yeah, I know I can?t believe that I just said that
D#m                     C#
What I really meant to say


           B                   F#
Is that I know that smile has broken a couple hearts
D#m              C#
You?re used to always getting what you want
B               F#                              D#m
Drop dead beautiful, knows how to knock them down
          C#
Oh girl, oh girl, check you out

  B                   F#
Yeah, that smile has broken a couple hearts
D#m              C#
You?re used to always getting what you want
B               F#                              D#m
Drop dead beautiful, knows how to knock them down
          C#
Oh girl, oh girl, check you out

B        F#
Oh-oh-oh-oh, ch-ch-ch-check you out
D#m       #
Oh-oh-oh-oh, check you out
B        F#
Oh-oh-oh-oh, ch-ch-ch-check you out
D#m      C#
Oh-oh-oh-oh, check you out

B                     F#
Oh, that smile has broken a couple hearts
D#m                       C#
That, that smile has broken, that smile
       B                          F#
No, I can?t believe that I just said that
D#m                     C#
What I really meant to say

Check you out


  B                   F#
Yeah, that smile has broken a couple hearts
D#m              C#
You?re used to always getting what you want
B               F#                              D#m
Drop dead beautiful, knows how to knock them down
          C#
Oh girl, oh girl, check you out
B        F#
Oh-oh-oh-oh, ch-ch-ch-check you out
D#m              C#
You?re used to always getting what you want
B               F#                              D#m
Drop dead beautiful, knows how to knock them down
          C#
Oh girl, oh girl, check you out

     
B        F#
Oh girl, oh girl, check you out
D#m       C#
Oh girl, oh girl, check you out