euphoric
Meaning: elated, uplifted
Usage: I was euphoric when I found out that my sister had given birth to twins.
jubilant
Meaning: extremely joyful, happy
Usage: The crowd was jubilant when the firefighter carried the woman from the flaming building.
elated
Meaning: overjoyed, thrilled
Usage: When she found out she had won the lottery, the writer was elated.
ecstatic
Meaning: intensely and overpoweringly happy
Usage: The couple was ecstatic when they learned that they had won the lottery.