To look like a million bucks, you don't have to spend a million bucks. To get a sophisticated Hollywood star-like look here are some tips from star stylist Megan Wright.
My best tip is chose your focal point and stick to only one. Either decide on a strong emphasis on the eyes or on the lips but not on both. You want to achieve a sophisticated look without being overdone.
The outfit you chose should be appropriate for the event. Elegant evenings call for neutral colors and more reserved styles. I also recommend a single focal point as well. That means try to avoid a dress that has a deep cleavage and at the same time is very short. If both the cleavage and the length are moderate, you can do both.
If you don't have time to prepare and need to skip some steps to your preparation, never skip the hair step ! Whether you decide on loose hair or on a do, my best advice is to keep it simple. You might be tempted to go with some elaborate updos but the trend these days is effortless chic.
Jewelry is the final step that will take your look to the next level. You should always go with your look complement it. If your outfit has a decolletage, chose a necklace, if your hair is up, add a beautiful pair of earrings. The only advice I have is to pick something that sparkles and that makes you feel sexy. The rest is up to you.