Anne Hathaway has legs for days in a chic 1960s mini as she and Gabrielle Union star in the SXSW premiere of their romantic comedy The Idea Of You

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

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

For her latest public appearance, Anne channeled the 1960s in a chic and elegant little retro mini dress that sparkled a little under the lights.

The bias-cut number featured jagged mirror designs, along the hemline and atop her enviably taut stomach.

She let her long curtains of brown hair fall freely over her shoulders, allowing a touch of bangs to grow.

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

Anne completed her ensemble by balancing expertly on a towering pair of pale gold heels which complemented the silver dress and gray nail polish.

Gabrielle Union showed off her slender figure in a sleeveless black blazer that plunged down to flaunt her cleavage and hint at her taut stomach.

Adding a casual touch to the look, she donned a pair of shorts which showed off her sky-high legs as she posed on a pair of black stilettos.

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

He opted for spring chic in a charming oversized beige suit, worn over a black shirt with a few tantalizing buttons undone on his chest.

Offering photographers his winning smile, the 29-year-old English comedian raised one arm to flash a friendly peace sign.

Ella Rubin, 22, who plays Anne’s character’s daughter, caused a stir in a nude corset that put her curves on full display.

She paired the top with a floor-length nude dress that was dripping with shimmering silver fringe reminiscent of the 1920s.

Various other stars from the film could be seen on the red carpet, including Meg Millidge, looking Austin chic in a denim dress with leather boots.

Handsome hunk Reid Scott made a statement in a garish gold top under his brown suit, while Brent Bailey cut a distinguished figure in head-to-toe black.

Jon Levine wore a navy suit over a white vest that contrasted elegantly with the black v-neck he chose instead of a dress shirt.

Cathy Schulman wore a cocktail dress with cheeky lace accents on the neckline and Jordana Mollick foreshadowed spring in a pleated floral piece.

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

Once the event began, Anne – after donning a more casual top and jeans combo – took the stage with her co-stars Nicholas and Ella to address the crowd.