New to this and I worked out the chords on my 
soprano ukulele. Any alterations please let 
me know. 
I've added the chords for the 1st verse, 
it's the same for the second. I hope you
enjoy :)

Chords used:
E (022100@1)name="chord_x02220@1">A
F#m (244222@1)name="chord_x2444x@1">B

Verse:
EIt's (022100@1)the heart on your sleeve never making me wonder
AIt's (x02220@1)the bond that we tie up and over and under
E (022100@1)                                                  AYou're (x02220@1)the sun and the rain and my grass is always green
E (022100@1)                                                     AWith (x02220@1)a kiss on my cheek, always letting me know I'm the birds and the bees

I'm the apple in your eye
E (022100@1)                                           AI (x02220@1)know that you know that I know you're all I need

Pre Chorus:
F#m (244222@1)                               B (x2444x@1)
And just when I thought it couldn't get any better
          E (022100@1)                 AThere (x02220@1)you go and do it all a-gain
F#m (244222@1)                    B(hold (x2444x@1)until "you")
Hope this feeling never ends

Chorus:
       E-A-E-A
'Cause you
A (x02220@1) BYou (x2444x@1)make me happy
E-A-E-A
You
A (x02220@1) BYou (x2444x@1)make me happy

It's the sound of your voice at the end of the phone line
A tickle in my toes just to know that you're all mine
Like an ice cream sundae with a cherry on the top
It's the look in your eyes when I'm wearing your t-shirt
Your cute little smile after a long day of hard work
And I know that you know that I can't give you up

And just when I thought it couldn't get any better
There you go and do it all again
Hope this feeling never ends

'Cause you
You make me happy
You
You make me happy

Just when I thought it couldn't get any better
There you go and do it all again
Hope this feeling never ends

You
You make me happy
You
You make me happy
You
You make me happy
You
You make me happy