YOU SAID:

there a party in my belly

INTO JAPANESE

私の腹の中にパーティーがある

BACK INTO ENGLISH

There is a party in my belly

INTO JAPANESE

私の腹にはパーティーがあります

BACK INTO ENGLISH

There is a party on my belly

INTO JAPANESE

私の腹にはパーティーがあります

BACK INTO ENGLISH

There is a party on my belly