Published: 13:18 BST, 2 July 2013 | Updated: 16:54 BST, 2 July 2013
She's more often than not seen looking moody and subdued.
So when Kristen Stewart smiles, it is usually to make a point - as she proved at the Chanel Paris Fashion Week show on Tuesday.
The Twilight actress appeared to be somewhat overdoing the joviality as she laughed it up while posing for photographers outside the highly-anticipated show.
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What rumours? Kristen Stewart put on a jovial display at the Chanel Paris Fashion Week show on Tuesday, after it was claimed that her ex Robert Pattinson is now dating her friend Riley Keough
Monochrome chic: Kristen teamed black leather shorts with a white double-breasts jacket and black heels
And it would seem Kristen's overt display of happiness, whether feigned or genuine, may have something to do with recent reports that her ex Robert Pattinson has moved on - with her friend Riley Keough.
The actor had been spotted with a mystery redhead who was later revealed to be Elvis Presley's granddaughter Riley - with whom Kristen starred in recent movie The Runaways.
However, whether or not the information affected her, Kristen put on a cheery display as she posed before heading inside to take up her seat on the front row alongside Boardwalk Empire actor Michael Pitt.
Accessory queen: Kristen finished off her outfit with black leather driving gloves, several chain bracelets and a black Chanel bag
Picture perfect: Kristen posed confidently for the cameras ahead of the show
Hot to trot: Kristen looked super stylish in her ensemble
Entourage: Kristen was joined by a large group of people as she left the show
New romance? Robert is now said to be dating Riley Keough, with whom Kristen starred in movie The Runaways
Kristen looked incredible for the occasion in a pair of black leather shorts and white double breasted jacket.
She added a grungy twist to her otherwise fairly ladylike ensemble with black driving gloves, and accessorised with chain bracelets on each wrist and up her arms.
Kristen finished off her look with a pair of eye-catching black heels - a modern take on the classic T-bar.
Simple style: Kristen wore her hair tied back and opted for a smokey eye
That's better!: Kristen crossed her legs as she sat with Boardwalk Empire actor Michael Pitt in the front row of the show
Taking it all in: Vanessa Paradis, Kristen and Michael Pitt sat in the front row to watch the action
I like that one! The celebrity front row watch the designs go down the catwalk
She wore her brunette hair tied back in a updo, and highlighted her eyes with smoky eyeliner and silver glitter eyeshadow.
Kristen's appearance at the show was in sharp contrast to the way she looked while arriving in Paris as rumoured swirled about R-Patz and Riley.
Wearing a T-shirt and jeans, Kristen looked 'tired and worn out' as she touched down after jetting in from Los Angeles.
The news of Robert's reported new romance is unlikely to go down well with Kristen, who split from the actor in May amid claims the pair were unable to move on following her indiscretion with married film director Rupert Sanders last year.
Famous friends: Kristen posed up with Rose Byrne at the show
Star-studded: Other stars who attended the show included Rihanna, who wore a sheer shirt dress and not much else
Keeping it simple: Vanessa Paradis wore a white shirt and black trousers for the show
Quick change: Kristen was earlier seen looking casual in jeans and a T-shirt as she left her hotel and headed to the show