She's back! Kristen Stewart's all smiles on the Tonight Show

PICS! The Twilight starlet swapped her usual surly appearance for a big beaming smile on the US chat show

Robert Pattinson & Kristen Stewart's dressed-down date night - R-Patz, RPatz, Rob, Kristen, KStew, K-Stew, out. Hollywood, dinner, Ago, restaurant, see, pics, pictures, couple, pair, relationship, Twilight, news, Marie Claire
Robert Pattinson & Kristen Stewart's dressed-down date night - R-Patz, RPatz, Rob, Kristen, KStew, K-Stew, out. Hollywood, dinner, Ago, restaurant, see, pics, pictures, couple, pair, relationship, Twilight, news, Marie Claire
(Image credit: Splash)

PICS! The Twilight starlet swapped her usual surly appearance for a big beaming smile on the US chat show

Twilight starlet Kristen Stewart made her red carpet return over the weekend, putting her best foot forward for an appearance on the famous Jay Leno chat show.

SEE MORE KRISTEN STEWART STYLE HERE!

In her first promotional public outing since that hectic Twilight Eclipse campaign trail earlier on in the year, K-Stew stepped out onto The Tonight Show stage to talk about her new film, Welcome to the Rileys.

And what a difference a day makes...

Gone were the scruffy trainers, hoody and usual surly Stewart demeanor, and in their place, a decidedly smiley, stylish actress.

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The 20-year-old showed off her never-ending pins in a pair of black leggings, teamed with a chic grey blazer, quirky print tee and towering Louboutin heels.

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And renowned for her nervous, somewhat awkward television appearances, Kristen instead seemed relaxed and much more animated than in previous interviews, laughing and joking with her host.

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And while we're loving her new casual-cool styling, we're also big fans of the lighter layered tresses she's continuing to showcase - far less harsh than that Joan Jett rock-chick 'do, and more grown up than the long Bella Swan locks.

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LOOK BACK AT KRISTEN'S TOP HAIR & BEAUTY MOMENTS HERE KRISTEN STEWART STYLE HIGHS & LOWS

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