Take note of Rachel Bilson, young Hollywood.

She knows how to tame her rampant morning weave and gather her party-chic posse for some unwinding at Crown Bar.

There’s no need to look like a complete mess when you trudge in and stumble out of the elite clubs of L.A. Nor do you have to get behind the wheel of a car and hydroplane toward a shameful world of pain.

If only all of today’s young stars could pull off a night on the town with this much class.

Chin chin, Rachel!