The answer is:
Hera or Juno
Just a quick reminder, Hera and Juno are the same person. They have different names because one is Greek and one is Roman.
In this case, since you are using "Zeus", we would say "Hera" and not "Juno".
Although Hera was the queen and married to Zeus, her husband wasn't so faithful and would often go out to have affairs with mortals, nymphs, and immortals.