Sky Is the Limit

There is no upper limit to what can be achieved

Be on Cloud Nine

To be extremely happy

Eye Candy

Something or someone that is attractive to look at but not necessarily substantial

Fit as a Fiddle

To be in very good physical condition

Steal Someone's Heart

To cause someone to fall in love with you

Cry over Spilt Milk

To be upset about something that has already happened and cannot be changed