Anne Hathaway has legs for days in 1960s chic mini as she and Gabrielle Union lead stars at SXSW premiere of their rom com The Idea Of You

Anne Hathaway and Gabrielle Union led the stars at the SXSW premiere of their upcoming romcom The Idea Of You.

Gabrielle is a producer on the film, which stars Anne as a middle-aged single mother who has an affair with a much younger boy band superstar.

For her final public appearance, Anne channeled the 1960s in a sleek retro-chic mini dress that sparkled a bit under the lights.

The bias-cut number featured jagged mirror patterns, which ran along the hemline and at the top of her enviably toned midriff.

She let her long curtains of walnut hair fall freely over her shoulders, allowing a hint of bangs to grow inward.

Gabrielle (pictured) is a producer on the film, which stars Anne as a middle-aged single mother who has an affair with a much younger boy band superstar.

Anne Hathaway (left) and Gabrielle Union (right) led the stars at the SXSW premiere of their upcoming romcom The Idea Of You

For her final public appearance, Anne channeled the 1960s in a sleek retro-chic minidress that sparkled a bit under the lights.

For her final public appearance, Anne channeled the 1960s in a sleek retro-chic minidress that sparkled a bit under the lights.

The bias-cut number featured jagged mirror patterns, which ran along the hemline and at the top of her enviably toned midriff

She let her long curtains of walnut hair fall freely over her shoulders, allowing a hint of bangs to grow inward

The bias-cut number featured jagged mirror patterns, which ran along the hemline and at the top of her enviably toned midriff

The Princess Diaries star accentuated her unmistakably youthful features with makeup, including a pop of nude lipstick.

Anne completed her ensemble by expertly balancing on a sky-high pair of pale gold heels that complemented the silver dress and gray nail polish.

Gabrielle Union accentuated her slim figure in a black sleeveless blazer top that dipped low to show off her cleavage and hint at her toned midriff.

To add a touch of casual flair to the look, she donned a pair of shorts that showed off her staggering legs as she posed in a pair of black stilettos.

Nicholas Galitzine, who plays the boy band’s frontman, exuded movie star magnetism as he hit the red carpet for his film’s premiere.

He went for spring chic in a charming oversized tan suit, worn over a black shirt with a few buttons open seductively on his chest.

The 29-year-old English actor treated photographers to his winning smile and raised one arm to show a friendly peace sign.

Ella Rubin, 22, who plays Anne’s character’s daughter, wowed in a nude corset that highlighted her curves.

Gabrielle Union played up her slender body in a black sleeveless blazer top that dipped low to show off her cleavage and hint at her toned midriff

Gabrielle Union played up her slender body in a black sleeveless blazer top that dipped low to show off her cleavage and hint at her toned midriff

To add a touch of casual flair to the look, she donned a pair of shorts that showed off her staggering legs as she posed in a pair of black stilettos.

To add a touch of casual flair to the look, she donned a pair of shorts that showed off her staggering legs as she posed in a pair of black stilettos.

Nicholas Galitzine, who plays the frontman of the boy band, exuded movie star magnetism as he walked the red carpet for the premiere of his film

Nicholas Galitzine, who plays the frontman of the boy band, exuded movie star magnetism as he walked the red carpet for the premiere of his film

He went for spring chic in a charming oversized tan suit, worn over a black shirt with a few buttons open seductively on his chest.

The 29-year-old English actor treated photographers to his winning smile and raised one arm to show a friendly peace sign

He went for spring chic in a charming oversized tan suit, worn over a black shirt with a few buttons open seductively on his chest.

Ella Rubin, 22, who plays Anne's character's daughter, wowed in a nude corset that made the most of her curves

Ella Rubin, 22, who plays Anne’s character’s daughter, wowed in a nude corset that made the most of her curves

Several other stars from the film were seen walking the red carpet, including Meg Millidge, Austin chic in a denim dress with leather boots

Several other stars from the film were seen walking the red carpet, including Meg Millidge, Austin chic in a denim dress with leather boots

Veep hunk Reid Scott made a splash in a screaming gold top under his brown suit

Brent Bailey cut a distinguished figure in black from head to toe

Veep hunk Reid Scott impressed in a screaming gold top under his brown suit, while Brent Bailey cut a distinguished figure in head-to-toe black

Jon Levine wore a navy blue suit over a white vest that elegantly contrasted with the black v-neck he opted for in place of a shirt

Jon Levine wore a navy blue suit over a white vest that elegantly contrasted with the black v-neck he opted for in place of a shirt

Cathy Schulman modeled a cocktail dress with provocative lace accents across the décolleté

Jordana Mollick foreshadowed spring in a pleated floral number

Cathy Schulman modeled a cocktail dress with sassy lace accents across the décolleté and Jordana Mollick predicted spring in a pleated floral number

Meanwhile, Michael Showalter, the pic's director, wore a shirt and tie under a more casual jacket, teaming the look with sneakers

Meanwhile, Michael Showalter, the pic’s director, wore a shirt and tie under a more casual jacket, teaming the look with sneakers

Once the event got underway, Anne - after switching to a more casual top and jeans combination - took to the stage with her co-stars Nicholas and Ella to address the audience.

Once the event got underway, Anne – after switching to a more casual top and jeans combination – took to the stage with her co-stars Nicholas and Ella to address the audience.

She paired the top with a floor-length nude dress, dripping with shimmering silvery fringe, reminiscent of the 1920s.

Several other stars from the film were seen walking the red carpet, including Meg Millidge, Austin chic in a denim dress with leather boots.

Veep hunk Reid Scott impressed in a screaming gold top under his brown suit, while Brent Bailey cut a distinguished figure in head-to-toe black.

Jon Levine wore a navy blue suit over a white vest that contrasted elegantly with the black v-neck he opted for in place of a shirt.

Cathy Schulman modeled a cocktail dress with sassy lace accents across the décolleté and Jordana Mollick foreshadowed spring with a pleated floral number.

Meanwhile, Michael Showalter, the pic’s director, wore a shirt and tie under a more casual jacket, teaming the look with sneakers.

Once the event got underway, Anne – after switching to a more casual top and jeans combination – took to the stage with her co-stars Nicholas and Ella to address the audience.