Storm in a Teacup

A lot of commotion or fuss about a trivial matter

Steal Someone's Heart

To cause someone to fall in love with you

Ball Is in Your Court

It is your turn to take action or make a decision

Sophisticated

Having refined taste, knowledge, or experience of the world

Cost an Arm and a Leg

Something that is very expensive

Out of the Blue

Unexpectedly, without warning