The Chorus and verse are nearly identical with the exception of the Em on the third line.
C G
There's a party in my pants and you're invited
D
A big fiesta in my trousers I'm excited
G C
I'm so happy my little cupcake I can't hide it
G D G
There's a party in my pants and you're invited
G C
I'm sick and tired of sad and broke and busted
G D
I'm takin' leave of my troubles today
Em C
Hide everything you don't want to get shattered
G D G
Woah, Tonight we're gonna roll the rules away.
Chorus/intro repeat
If you're tired of knock knock jokes and conversation
Crank up the radio and kill the light
Let's get on this gay love celebration
We gonna party in my britches tonight
Chorus/intro repeat