be floating/walking on air

to be very happy and excited because something very pleasant has happened to you.

When the doctor told me I was going to have a baby, I was walking on air.

• keep something under your hat
• keep something up to date
• keep sweet
• keep tabs on
• keep tabs on someone
• keep tabs on something
• keep the ball rolling
• keep the home fires burning
• keep the peace
• keep the wolf from the door
• keep time
• keep to
• keep to something
• keep to yourself
• keep track
• keep track of
• keep track of someone
• keep track of something
• keep under hat
• keep under wraps
• keep under your hat
• keep up
• keep up appearances
• keep up something
• keep up to date