Courtney

E|----------------------------------------------------------------------------|
B|----------------------------------------------------------------------------|
G|-------------5-5-5-5-5-5-5-5------------------------------------------------|
D|----7--5-----5-5-5-5-5-5-5-5---5-5-5-5-5-5-5-5--7-7-7-7-7-7-7-7-7-7---7--5--|
A|----7--5-----3-3-3-3-3-3-3-3---5-5-5-5-5-5-5-5--7-7-7-7-7-7-7-7-7-7---7--5--|
E|----5--3-----------------------3-3-3-3-3-3-3-3--5-5-5-5-5-5-5-5-5-5---5--3--|

Same in verses but palm muting added.

Before chorus

E|----------------------| One strum each
B|----------------------|
G|----------------------| She wore grungy clothes bit.
D|-----3---------5------|
A|-----3---------5------|
E|-----1---------3------|
Chorus

E|----------------------------|
B|----------------------------|
G|----5------------7----------|
D|----5-----3------7-----5----|
A|----3-----3------5-----5----|
E|----------1------------3----|

After first chorus 

     F5    E5   D5     C5  D5
E|------------------------------|
B|------------------------------|
G|----------9----7-----5----7---|
D|----3-----9----7-----5----7---|
A|----3-----7----5-----3----5---|
E|----1-------------------------|
Chords are strummed a few times

Before final chorus

C5 (let ring)
Now I’m overweight and ugly, just like you used to be,
C5 (let ring)                    C5 (palm mute)
Why can’t I be like you, then we can drive away to Malibu,

Outro part (played earlier in song too)

E|-----------------------------------------|
B|-----------------------------------------|
G|-----------9-----7--------5-----7-----9--|
D|----3------9-----7--------5-----7-----9--|
A|----3------7-----5--------3-----5-----7--|
E|----1------------------------------------|
Hit once each to sound best.