Usted tiene grandes tetas.
Ella tiene pechos grandes.
Big breasts are 'des gros seins' (familiar/slangish) in French.
balshiyi grudi
Be confident and proud about it. :)
grande is big in Spanish. pronounciation (grondeh)
You could say "tienes buenas tatas".
senos (breasts)
chupa mis chiches
grande
grande
Grande.
The big party would be "El fiesta grande" in Spanish.