Her white chiffon evening dress has wide parallel vertical lines that go from the bottom up, branch at her hips, start up again at her waist, and trim her neckline.

It is a very flattering look for Ashley's figure. The fit is just right; it's neither too tight, nor too loose.

Still, some teenage girls might think it's too demure for a prom dress. The key dress design elements are all very conservative: color, shape, neckline, length, and pattern.

But if you like the elegance of simplicity, and you're not a drama queen, it could be perfect for you at prom.

Have to say it's nice to occasionally see a young Hollywood star who is mature enough to dress up for a night out without going over the top. Thank you, Ashley.