Someone else has tabbed out the intro riff but they haven't put the chords on so here they are.

am                                     
karen says i've reached my target weight
dm
kate emma and kristin know it's fake
G (320003@1)                                        cthe (x3101x@1)problem is diet's not a big enough word.i wanna be so
B5 (x244xx@1)                        em
skinny that i rot from view
Eb5 (xx134x@1)D5 (xx023x@1)  C5 (x355xx@1)           D5 (xx023x@1)         Eb5 (xx134x@1)        D5 (xx023x@1)     C5 (x355xx@1)E5I (022xxx@1)I I I I want to walk in the snow and not leave a foot print        x2

It then goes back to the intro riff followed by this sequence again.

The end of the song is c  f  g  a   repeated many times.