Ella tiene pechos grandes.
Usted tiene grandes tetas.
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)
grande
grande
Grande.
chupa mis chiches
The big party would be "El fiesta grande" in Spanish.