ridiculously happy

Beyond happy, happier than any one person has a right to be, so happy it makes others want to be sick or violent, stupid happy.
When you are so happy you need multiple synonyms of the word happy just to stress how stupid happy you are.

Karen can't stand how ridiculously happy Jared is with his new Girlfriend, it makes Karen want to punch her in her stupid face.
They are so happy it's ridiculous; ridiculously happy.