Hey, this is my first tab, i enjoy this song, i hope you'll enjoy playing it and singing it :)
It's always the 2 same chords (very easy so) : Am, Dm
You can use no capo, or put CAPO 5 and play Em and Am, it's like you prefer cause it's the same.



          |--------------|-------------|
          |     Capo 5   |  No Capo    |
Chords    |  E A D G B E | E A D G B E |
          |--------------|-------------|
Em (Am)   |  0 2 2 0 0 0 | 5 7 7 5 5 5 |
Am (Dm)   |  0 0 2 2 1 0 | 5 5 7 7 6 5 | 
          |--------------|-------------|

It's the version with the capo on 5

PRE-CHORUS
Em          Am
Ooh, na-na, look what you done started it
Em          Am
Ooh, na-na, why you gotta act so naughty
Em          Am
Ooh, na-na, I'm 'bout to spend all this cash
Em          Am
Ooh, na-na, if you keep shaking that, oh yeaah

CHORUS
Em                      Am
Ooh, na-na-na, put your hands in the air if you're loving tonight
Em                      Am
Ooh, na-na-na, keep your hands in the air if you're spending the night
Em                     Am
Ooh, na-na now, na-na, na-na-na-na-na, everybody say it like
Em                     Am
Ooh, na-na now, na-na, na-na-na-na-na, everybody say


Em
Baby I'm the one you like yeah
      Am
I'ma give you whatcha' like yeah, oh, yeah
     Em
I'ma give it to you right, yeah
     Am
Best time of your life, yeah, oh yeah
Em
Baby when you ready tell the waitress get the check
Am
Girl I know you ready I ain't even gotta check
Em                         Am
You been through the worst let me show you who the best
         Em                  Am
You know I'ma get you right, get them boys to the left, like


PRE-CHORUS
Em          Am
Ooh, na-na, look what you done started it
Em          Am
Ooh, na-na, why you gotta act so naughty
Em          Am
Ooh, na-na, I'm 'bout to spend all this cash
Em          Am
Ooh, na-na, if you keep shaking that, oh yeaah

CHORUS
Em                      Am
Ooh, na-na-na, put your hands in the air if you're loving tonight
Em                      Am
Ooh, na-na-na, keep your hands in the air if you're spending the night
Em                     Am
Ooh, na-na now, na-na, na-na-na-na-na, everybody say it like
Em                     Am
Ooh, na-na now, na-na, na-na-na-na-na, everybody say


Em
You the one who's hella bad, yeah
        Am
You the one they never had, yeah, oh, yeah
Em
All the problems you done had , yaah
           Am
Leave them broke fellas in the past, yeah, oh, yeah
Em                             Am
Girl you had good, but I could give you better
Em                           Am
I'll have you thinking 'bout forever
Am
I'm a make you say

PRE-CHORUS
Em          Am
Ooh, na-na, look what you done started it
Em          Am
Ooh, na-na, why you gotta act so naughty
Em          Am
Ooh, na-na, I'm 'bout to spend all this cash
Em          Am
Ooh, na-na, if you keep shaking that, oh yeaah

CHORUS
Em                      Am
Ooh, na-na-na, put your hands in the air if you're loving tonight
Em                      Am
Ooh, na-na-na, keep your hands in the air if you're spending the night
Em                     Am
Ooh, na-na now, na-na, na-na-na-na-na, everybody say it like
Em                     Am
Ooh, na-na now, na-na, na-na-na-na-na, everybody say

BRIDGE
Em           Am
I'm feeling lucky tonight (Everybody say)
Em                                 Am
When we leave this party, you gon' love me tonight
Em           Am
You feeling lucky tonight (tonight girl)
Em                                 Am
When we leave this party, you gon' love me tonight


CHORUS
Em                      Am
Ooh, na-na-na, put your hands in the air if you're loving tonight
Em                      Am
Ooh, na-na-na, keep your hands in the air if you're spending the night
Em                     Am
Ooh, na-na now, na-na, na-na-na-na-na, everybody say it like
Em                     Am
Ooh, na-na now, na-na, na-na-na-na-na, everybody say