The Prom

You walk into Forever 21 with your friends proudly like nothing is happening. You walk around the store and finally pick your top five favorite dresses. You take the dresses into the dressing room and tries them all on. You take forever, but finally chose the Silver sparkly dress with a double zipper in the back.
"I found the dress" you tell yourself.
You walk out carrying the dress in your hand. Your friends see you, but you act like you are just putting it back on the rack. Instead, you slip in into your purse. Smoothly you walk out of the store with your friends not knowing that there is an alarm on the dress. You step through the doors as the alarm goes of.
What do you do?