Lots of good information here in this thread.
However the "Hollywood Portrait" can be made as complex as you want to make it, or as simple as it can be. There are some very simple ways to achieve near exact and similar effects.
Available light when used as a key light can be controlled, bounced, be cut or reduced with silks or scrims, or reflected exactly as expensive hot lights. It allows you to work with the larger lens openings that compliament the "Hollywood" look.
Direct sunlight can be controlled with exactly the same tools and can give a very nice look to a portrait. All this stuff is bulky is hard to transport and set up and then reset after the wind blows it down. That is why so many individuals were necessary to a film crew. Most photographers avoid direct sunlight like it was a rattlesnake, but when used, meaning controlling the sun light can do wonderous things. It is a single light source that easily can tamed with scrims and reflectors and a multitude of other devices to do with it what you will. None of us are limited to the artificial lighting that we may own or wish for, but if we want to actually really make a special type of photograph we can and will find a way. "Hollywood Glamor" is tougher to do out doors with sunlight and other available light but it can be done! Use your imagination, study the tools early studio photographers used and make your own copies of Gobo's flags and reflectors. The only light source available to them was the Sun, a skylite in a studio could be controled with a scrim or curtain. Shadows created by cutters, flags, fingers, and simple panels on stands to knock out stray light. Give it a try, it is amazing what quality you can create with the most simple 0f tools. Don's mention of the 100 wt light
bulb earlier in this thread is right on the money. A fantastic way to learn! A fantastic way to make great pictures while you are learning!