Paris by night: Smouldering Emma Watson comes of age in new Trésor Midnight Rose perfume ad

By Daisy Dumas

Last updated at 2:41 AM on 3rd September 2011

As she leaves the days of Harry Potter behind her, Emma Watson takes another step towards becoming a defining figure in the world of fashion and beauty.

Stepping from one role to another, the face of Lancôme has firmly made the new lead position hers - and has proved that she has well and truly come of age in the process.

In a new ad for Lancôme Trésor Midnight Rose perfume, the star oozes elegance and charm as she wins the affections of French actor Cyril Descours.

Ooh la la: The Lancôme ad shows a sophisticated Emma Watson winning the heart of her French Monsieur

Paris by night: Ms Watson says the new perfume is 'addictive and warm'

The playful storyline sees a refined and edgy Emma accidentally leaving her trilby hat in a Parisian book store. The helpful - and devastatingly handsome - Descours attempts to return the hat to the Mademoiselle... and the two eventually clinch - well, almost - under a night sky on the banks of the Seine.

The actress morphs between coquettish, boyish cool and evening chic in the love story, her red lips and jaunty hat a world away from her days at Hogwarts.

The award-winning 21-year-old actress follows in the footsteps of Hollywood stars Kate Winslet and Penelope Cruz who fronted advertising campaigns for the French company in the past.

At the launch of the fragrance in May, the British actress said the perfume is 'addictive, it's warm, it's playful, it's sweet, it's everything I hoped it would be.'

Bonjour: A boyishly dressed Ms Watson asks for help in the bookstore - and sparks fly...

Eyes lock: The love story then takes to the streets of Paris after Emma leaves her hat in the store

She has also starred in Burberry campaigns and is no stranger to front rows of some of the most high profile fashion weeks catwalks.

The ad was shot in Paris back in March, when, despite looking immaculate while the cameras were rolling, Emma chomped on chicken kebabs during the break - proving not all A-list stars deprive themselves for their size zero frames.

The former child star, who is the face of the brand, confessed she wasn't much of a fragrance connoisseur before joining the project.

She said: 'I didn't really like perfumes before because I thought they were heavy, but this one is really light and playful.

'I feel lucky to embody a fragrance I am so crazy in love with.'

Classic beauty: Emma Watson ditches her English Rose look for something a little edgier in new Lancôme Trésor Midnight Rose Perfume advert

Flirtatious: Emma teases her male model, whose profile is reminiscent of Nick Jones, with a hat

The brunette beauty raved about her wonderful time in France, tweeting to her one million followers: 'Had such an amazing time in Paris with Lancome!

'Soon to start filming Perks of Being a Wallflower - can't wait! Hope everyone's ok xx'

The new production will see Emma sidestep away from the JK Rowling series with a more series role.

The story follows Charlie, a high-school freshman, who is struggling to cope with mental issues.

He is introduced to the world of sex and drugs by friends, Sam - played by Watson - and Patrick.