this is a pretty simple song so it shouldne take u long to figure out how to play it so 
it is

intro
(do this acouple times, i dont think this is exactly right but its     something like this)

e--000--000--0000--00--00--00--00------------------------------------|
b--888--666--5555--33--55--33--55------------------------------------|
g--------------------------------------------------------------------|
d--------------------------------------------------------------------|
a--------------------------------------------------------------------|
d--------------------------------------------------------------------|

Pre verse and second half of first verse (sumtin like this)
e---000--000--0000-00-00-00---------------------------------|
b---888--666--5555-33-55-33---------------------------------|
g-----------------------------------------------------------|
d-----------------------------------------------------------|
a-----------------------------------------------------------|
d-----------------------------------------------------------|

Chorus
(i dont know the exact count of howmany times he plays it so u gotta figure that out)
e------------------------------------------------------------|
b------------------------------------------------------------|
g------------------------------------------------------------|
d--77777--777--33333--33--00000--000-------------------------|
a--77777--777--33333--33--00000--000-------------------------|
d--77777--777--33333--33--00000--000-------------------------|

Then the interlude where hes laughing and stuff i dont think theres any guitar and the 
verse there isnt anyguitar intil the next chorus

then he likt hits the strings on the head stock then he plays the chorus again then he 
this with the piano part

e-------------------------------------------|
b-------------------------------------------|
g-------------------------------------------|
d----777--777-77-777-777-7777---------------|
a----555--555-55-555-555-5555---------------|
d-------------------------------------------|

then the chorus again

thats pretty much it, i know its not 100% but it'll get you started