As summer heats up, we all struggle a lit bit more to keep our hair looking perfect and fizz-free. But, according to Jessica Biel, we’re just wasting our time. At last night’s L.A. premiere of her new film I Now Pronounce You Chuck and Larry, the always well-tressed actress let PEOPLE in on her hair secrets — less is definitely more! Jessica tells PEOPLE, “I’m all about beach hair. Don’t brush it, scrunch it, mess it up, let it be dirty, let it be messy, let it be sweaty. I think it looks way better than trying to straighten it, and trying to make it look nice because no matter what, it’s going to frizz, so just let it be dirty.” Nice to know that someone in Hollywood is low maintenance — at least off the red carpet!