Charlize Theron effortlessly stuns at SXSW in floral dress with Long Shot ...

Her new film Long Shot premiered on Saturday at SXSW.

And Charlize Theron returned to the Austin, Texas-based media festival on Sunday for the Variety NATO Panel.

The 43-year-old actress was joined on stage by her co-star from the upcoming flick, Seth Rogen, and the movie's director Jonathan Levine. 

Effortless: Charlize Theron returned to the Austin, Teas-based media festival on Sunday for the Variety NATO Panel

Effortless: Charlize Theron returned to the Austin, Teas-based media festival on Sunday for the Variety NATO Panel

Charlize looked effortlessly beautiful in a shin-length floral black-and-white dress with a dark belt cinched around her slender waist.

She threw a black blazer over her shoulders and rolled the sleeves up her wrists, highlighting her eggshell blue fingernails.

The Atomic Blonde star left her newly dyed dark tresses to fall unencumbered just past her chin. 

Gorgeous: Charlize looked effortlessly beautiful in a shin-length floral black-and-white dress with a dark belt cinched around her slender waist

Gorgeous: Charlize looked effortlessly beautiful in a shin-length floral black-and-white dress with a dark belt cinched around her slender waist

Relaxed: Rogen kept things casual in a yellow sweater which he paired with a straight-legged blue jeans

Relaxed: Rogen kept things casual in a yellow sweater which he paired with a straight-legged blue jeans

Working together: The 43-year-old actress was joined on stage by her co-star from the upcoming flick, Seth Rogen, and the movie's director Jonathan Levine

Working together: The 43-year-old actress was joined on stage by her co-star from the upcoming flick, Seth Rogen, and the movie's director Jonathan Levine

Talking it out: Levine, 42, meanwhile also opted for a laid-back look, sporting a grey sweatshirt and jeans

Talking it out: Levine, 42, meanwhile also opted for a laid-back look, sporting a grey sweatshirt and jeans

Rogen kept things casual in a yellow sweater which he paired with a  straight-legged blue jeans.

The 36-year-old donned glasses as he answered questions during the panel.

Levine, 42, meanwhile also opted for a laid-back look, sporting a grey sweatshirt and jeans.

Cute: Imogen Poots couldn't keep the smile from her face as she walked the red carpet for the premiere of her film, The Art of Self-Defense

Cute: Imogen Poots couldn't keep the smile from her face as she walked the red carpet for the premiere of her film, The Art of Self-Defense

Imogen Poots couldn't keep the smile from her face as she walked the red carpet for the premiere of her film, The Art of Self-Defense.

She donned a a slightly see-through black t-shirt that revealed a black bra underneath.

The 29-year-old tucked the top into a pair of black trousers and tied a multicolored bonnet around her dark tresses. 

Her co-star Jesse Eisenberg, 35, kept things casual in blue jeans, a grey t-shirt, and threw a fleece-lined jacket over top.

All smiles: The 29-year-old tucked the top into a pair of black trousers and tied a multicolored bonnet around her dark tresses

All smiles: The 29-year-old tucked the top into a pair of black trousers and tied a multicolored bonnet around her dark tresses

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