So I tried to find the chords by ear, I think they are correct. The C in brackets 
is optional, and the Dm7 could be replaced by Dm. Hope you like it, please rate :)

Key: Am

I am so fab
Check out I'm blonde, I'm skinny, I'm rich
And I'm a little bit of a bitch

Am                        C     G
I wanna dress you up in silk, Taffeta
Am                               C
Tailor these clothes to fit your guilt
G
What's your size?
Am                                C   G
This purse can hold my black card and tiara
Am                 C           G
Versace promises I will, Dolce Vita

F            G               Dm
What do you wanna wear this spring?
                         (C)     F
What do you think is the new thing?
             G                Am
What do you wanna wear this season?

         Am
Donatella (I'm smoking 'em on full tank of gas)
         Am
Mi-Mi-Bella! (I'm a rich bitch, I'm the upper class)
            Am
All of the day (I'm the pearl to your oyster, I'm a babe)
           Am                                 C
I'm gonna smoke Marlboro Lights and drink champagne
                     G
(I smoke Marlboro Red and drink champagne)
        F
Donatella
                 G                    Am
Cuz she walks so bad like it feels so good
               Dm7            
Listen to her radiate, her magic
F                  G                    
Even though she knows, she's misunderstood
Am
Voodoo-Voodoo
G
Voo-Don-Na-Na

Am                              C          G
Walk down the runway but don't puke, it's ok
Am                    C         G
You just had a salad today, Boulangerie
Am             C                 G
Just ask your gay friends their advice, before you
Am           C              G
Get a spray tan on holiday, in Taipei

F            G               Dm
What do you wanna wear this spring?
                         (C)     F
What do you think is the new thing?
             G                Am
What do you wanna wear this season?


         Am
Donatella (I'm smoking 'em on full tank of gas)
         Am
Mi-Mi-Bella! (I'm a rich bitch, I'm the upper class)
            Am
All of the day (I'm the pearl to your oyster, I'm a babe)
           Am                                 C
I'm gonna smoke Marlboro Lights and drink champagne
                     G
(I smoke Marlboro Red and drink champagne)
        F
Donatella
                 G                    Am
Cuz she walks so bad like it feels so good
               Dm7            
Listen to her radiate, her magic
F                  G                    
Even though she knows, she's misunderstood
Am
Voodoo-Voodoo
G
Voo-Don-Na-Na

Am
Check it out, take it in
Am
Who's that bitch? She's so thin
Am
She's so rich and so blonde
Am
She's so fab, it's beyond

F            G               Dm
What do you wanna wear this spring?
                       (C)    F
What do you think is the new thing?
             G                D7
What do you wanna wear this season?
        F     G         Am   C 
Donatella (Ooh), Donatella (Ooh)
            Dm
All of the day
                                        D7
I'm gonna wear designer and forget your name
        Am
Donatella
       
       F 
Donatella
                 G                    Am
Cuz she walks so bad like it feels so good
               Dm7            F
Listen to her radiate, her magic
                 G                     Am
Even though she knows, she's misunderstood
Voodoo-Voodoo
G           Am
Voo-Don-Na-Na
            Am
Voo-Don-Na-Na

[Ends in Am]