Emma Watson finds dressing age-appropriately is "quite difficult".

The 21-year-old actress - who recently topped Glamour UK magazine's Best-Dressed Women 2011 list - admits it's hard to get the right look at red carpet events although she prefers a "less is more" approach.

Emma told WWD: "I try to dress age-appropriately, which isn't actually that easy when obviously high-end clothing is designed for women who are older than I am.

"It's a fine line to tread between looking smart and looking ready to go on a red carpet but also looking like I'm 21. It's quite difficult.

"I think less is more - less makeup, less accessories is better."

Emma - who is the face of Lancome - recently helped chose the colour of the brand's Tresor Midnight Rose women's fragrance, which is due out worldwide in September.

She has also been heavily involved in the advertising campaign - which was shot by Mario Testino - which impressed her bosses.

She added: "It's funny, the guys at Lancome were like, 'You need to be directing, Emma.' I had ideas about every aspect. I'm sure I drove them insane.

"I was involved in the concept for the [ad] film and the tag line, 'Catch my heart if you can.' "

"The hat [in the ad] was my hat, which I bought at a Flea market in Paris. I was very involved in The Script. It's been really fun for me."