She's the longest-serving face of London-based make-up brand Rimmel - but Kate Moss couldn't resist trying out a freebie from French rival Dior at Paris Fashion Week.
The fashion icon was spotted putting some last-minute finishing touches to her pout before sitting in the frontrow of Dior's catwalk show at Paris Fashion Week - and the silver-cased lipstick was most definitely from the Paris fashion house's latest make-up range.
Mail Online can reveal Kate was using a tester of one of Dior's Addict lipsticks, in a shade called Charmed Pink - or number 578 as it says on the base - which came out at the end of the summer.
Pout and about: Kate Moss leaves the Ritz Hotel on her way to the Christian Dior fashion show in Paris yesterday - and plumps up her lips with the latest Dior lipstick.
Oh la la!: Kate put on the pink shade from Rimmel rivals Dior
In the pink: Kate was wearing Charmed Pink from the new Dior Addict range, right
Kate has been the face of the Rimmel for the past nine years, alongside the brand's other ambassadors Sophie Ellis Bextor, Ayumi Hamasaki, Lily Cole, Zooey Dechanel, Solange Knowles Alejandra Romas Munoz and Georgia Jagger.
However, Kate put in some sterling work showing off the Dior lippy by making sure she showed off the new shade by pursing her mouth into a pout for much of the show.
Oops!: The model appears to realise what she's done backstage at the Christian Dior Ready to Wear Spring/Summer 2011 show during at Espace Ephemere Tuileries
We wonder if Rimmel bosses are going to give her any lip over it...
Miss Moss was joined in the front row by former The O.C. star Rachel Bilson to see British designer John Galliano's vision for Dior's Spring/Summer 2011 collection, which sees him apparently imagine that Dior had 'dropped anchor at a South Pacific naval base'.
Kate almost caused pandemonium amongst the paparazzi as she arrived wearing a black fur shrug and black leather mini-dress, both by Dior, she watched from the front row, alongside the president and chief executive of Christian Dior, Sidney Toledano.
She was also wearing almost black nail varnish to watch the Dior models strut their stuff in the style of 1950s pin-up Bettie Page with their coiffed hair and bright red lips.
Fashion forward: Kate Moss arrives amidst the chaos of Paris Fashion Week to see John Galliano's latest collection for Dior.
Catwalk queen: Kate applauds the Dior show then leans in for a closer look.
Dior fan: Rachel Bilson was also at the Dior catwalk show
Ms Moss had scrubbed up rather nicely after looking a bit of a mess with bird's nest hair at Vogue's 90th anniversary party in the French capital on Thursday night.
That bash saw celebrities including Tyra Banks and Natalia Vodianova don their finery as well as David Walliams and wife Lara Stone, who features on the cover of this month's issue of French Vogue, which has the same Eyes Wide Shut theme as the party's masked ball theme.
However, Kate, who was accompanied by her rock star boyfriend Jamie Hince, drew comments because of her bird's nest hair.
Other designers to show so far at Paris Fashion Week, which kicked off on Thursday, have included Zac Posen, Rochas and Nina Ricci.
It follow hot on the heels of London Fashion Week and New York Fashion Week - with Milan still to come.
Kate Mess: The star was out with bird's nest hair at the Paris Fashion Week Vogue party on Thursday night, seen here with boyfriend Jamie Hince