Summer Beauty Do's & Don'ts

Get the lowdown on the must-have looks of the season from PEOPLE's beauty expert. By Serena Kappes

TREND: LOOSE UPDOS

DO: Work with your hair's natural texture and pin it up casually (as seen on Mandy Moore and Eva Longoria). For very long hair, put your tresses in a ponytail and then work in bobby pins.

DON'T: Pile your hair on top of your head. "It's not a prom-queen look at all," says Gage.