How do i get beach waves like Blake Lively?

Naturally i have THICK straight hair, and it's so stubborn to heat and mousse, and since my hair is so thick it usually POOFS out majorly. Curlers don't usually work for me, nor does a curling iron. Blake Lively has such natural bouncy waves, is there an easier way for me to get waves like hers without it taking to much time or heat?