I've been looking and every tab says it goes in F# but it doesn't sound right to me. So 
my version, in G.

Party in the U.S.A - Miley Cyrus

Intro: G Bm Em
       G (320003@1)name="chord_x24432@1">Bm Em (022000@1)G (320003@1)                   DHopped (xx0232@1)of the plane at LAX
Em (022000@1)               AmWith (x02210@1)a dream and my cardigan
G (320003@1)                    DWelcome (xx0232@1)to the land of fame excess
Em (022000@1)               AmWow, (x02210@1)am I gonna fit in?

G (320003@1)                   DJump (xx0232@1)in the cab, here I am for the first time
Em (022000@1)                    AmTurn (x02210@1)to my right and I see the Hollywood sign
G (320003@1)               D (xx0232@1)Em (022000@1)           AmThis (x02210@1)is oh so crazy, everybody seems so famous

G (320003@1)                   DMy (xx0232@1)tummy's turning and I'm feeling kinda homesick
Em (022000@1)                AmToo (x02210@1)much pressure and I'm nervous
G (320003@1)                         DThat's (xx0232@1)when the taxi man turns on the radio
EmAnd (022000@1)the Jay-Z song was on
BmAnd (x24432@1)the Jay-Z song was on
EmAnd (022000@1)the Jay-Z song was on

G (320003@1)                    DSo (xx0232@1)I put my hands up, they're playing my song
Em (022000@1)              AmAnd (x02210@1)the butterflies fly away
G (320003@1)                 DNodding (xx0232@1)my head like yeah
Em (022000@1)              AmMoving (x02210@1)my hips like yeah
G (320003@1)                DI (xx0232@1)put my hands up, they're playing my song
Em (022000@1)                 AmThey (x02210@1)know I'm gonna be ok
G (320003@1)D (xx0232@1)  Em (022000@1)           AmYeah, (x02210@1)it's a party in the U.S.A
G (320003@1)D (xx0232@1)  Em (022000@1)           AmYeah, (x02210@1)it's a party in the U.S.A

Get to the club in my taxi cab
Everybody's lookin at me now
Like "whos that chick, thats rockin' kicks?
She gotta be from out of town"

So hard with my girls not around me
Its definitely not a Nashville party
Cause' all I see are stilletos
I guess I never got the memo

My tummys turnin and I'm feelin kinda home sick
Too much pressure and I'm nervous
That's when the D.J. dropped my favorite tune
and a Britney song was on
and the Britney song was on
and the Britney song was on

So I put my hands up, they're playing my song
And the butterflies fly away
Nodding my head like yeah
Moving my hips like yeah
I got my hands up, they're playin my song
They know im gonna be ok
Yeah, It's a party in the U.S.A
Yeah, It's a party in the U.S.A

Em (022000@1)                 AFeel (x02220@1)like hoppin' on a flight (on a flight)
Em (022000@1)               ABack (x02220@1)to my hometown tonight (town tonight)
Em (022000@1)               ASomething (x02220@1)stops me everytime (everytime)
G (320003@1)                       DThe (xx0232@1)DJ plays my song and I feel alright

So I put my hands up, they're playing my song
And the butterflies fly away
Nodding my head like yeah
Moving my hips like yeah
I got my hands up, they're playin my song
They know im gonna be ok
Yeah, It's a party in the U.S.A
Yeah, It's a party in the U.S.A

So I put my hands up, they're playing my song
And the butterflies fly away
Nodding my head like yeah
Moving my hips like yeah
I got my hands up, they're playin my song
They know im gonna be ok
Yeah, It's a party in the U.S.A
Yeah, It's a party in the U.S.A