On cloud nine
Extremely happy

Over the moon
Very happy or pleased

In high spirits
Cheerful and happy

Walking on air
Feeling extremely happy

Bubbling with joy
Overflowing with happiness

Happy as a clam
Very happy; content

A ray of sunshine
Someone who brings happiness to others

Jump for joy
To be extremely happy

In seventh heaven
In a state of extreme happiness

Grinning from ear to ear
Smiling widely; very happy

Life is a bowl of cherries
Life is very pleasant and enjoyable

Happy-go-lucky
Cheerful and carefree

Full of the joys of spring
Extremely happy and cheerful

Heart in the right place
A kind and good person; happy by nature

Light up someone's day
To make someone very happy

Bursting with happiness
Overflowing with joy

All smiles
Very happy; always smiling

Joy to the world
A feeling of happiness that is shared

Smiling like a Cheshire cat
Smiling broadly; very pleased

A happy camper
A person who is satisfied and content