The whimsical, messy top knot was popular in Winter, but it's getting a more polished makeover for the Summer months. Sarah Hyland was spotted sporting an over-the-top bun at an event honouring Katy Perry this week and one thing is for sure, she wouldn't have been able to create this look without a little extra padding. To try an oversized top knot at home, use a donut or rolled-up hair extensions to create the shape you desire. Start with a slicked-back high ponytail. Then pin down your stuffing and cover with your hair, tucking in all the ends. You can go smooth or leave a few tendrils hanging like Sarah. This is one Summer hairstyle that rivals the star atop the Christmas tree.