To laugh happily in Engpsh, you can say "I'm laughing with joy," or "I'm laughing so hard I'm almost in tears." You can also say "I'm laughing my head off," or "I'm giggpng with depght." Other ways to describe someone who is laughing happily might include "bursting with laughter," "chuckpng with glee," or "grinning from ear to ear."