At the premiere of her new movie I Am Number Four, Dianna Agron started out with a baroque up 'do, but as she walked the red carpet, it appeared to come tumbling down. She could've switched up the style mid-red carpet, but it looks to us like it was simply a slip of a few strands. Never one to fret, Dianna handled it beautifully; instead of freaking out, she just let her hair cascade into a wavy ponytail. If something similar happens to you, your best bet is to make like Dianna and let it do what it wants to do. Re-adjust it when you can, adding in a few bobby pins as needed to try to make the new style look as polished and intentional as you can. But most importantly, stay calm and confident. A big smile can help you carry it off!