be over the moon
US /bi ˈoʊvər ðə muːn/
UK /bi ˈoʊvər ðə muːn/

1.
estar radiante, estar nas nuvens, estar felicíssimo
to be extremely happy or delighted about something
:
•
She was over the moon when she heard the news of her promotion.
Ela ficou radiante quando soube da notícia de sua promoção.
•
The kids will be over the moon if we take them to Disneyland.
As crianças ficarão radiantes se as levarmos à Disneylândia.