What is it about Mandy Moore? No matter what the occasion is, she always manages to look totally stylish. Seen here, at the premiere of her new flick The Princess Diaries, Mandy's right on time in the fashion department -- once again -- rocking head-to-toe denim.

Her puff-sleeved '80s-inspired jacket and matching jeans ensemble is perfect. It's casual, but chic and trendy, too. Amazing.

We have just one question for Mandy: With her crazy schedule, how does she find time to shop?

Wanna make this look your own? It won't be hard. This Fall, denim's going to be HUGE. The best pieces to look for are jackets in unusual cuts like Mandy's puff-sleeved model or a longer coat. (Skip the classic five-pocket style this season!)

Mix and match 'em with jeans, ruffled Victorian-inspired dresses and skirts, or whatever else is in your closet. That's one of the best things about denim -- it goes with just about everything.