It was just a normal evening for Michelle and Barack Obama, attending a state dinner [1] in Buenos Aires alongside Argentine leader Mauricio Macri and his wife, Juliana Awada. But then, suddenly, two tango dancers swept them off their feet [2]. Michelle's satin, crystal-embellished dress swayed with the music, playing up her metallic Jimmy Choo kitten heels that were just the right height for dancing.

Maybe the FLOTUS wasn't expecting to show off her moves at the event, but then her flared cocktail number was a very happy coincidence [3]. Read on to see why the design's subtle pleating was made for the dance floor in the video below, then get all the details on Michelle's accessories and shop similar styles.

See more recent style moments from the Obamas:

Michelle Obama Is Continuing Her Winning Style Streak in Argentina [4]

The Obama Women's Top 8 Fashion Moments From That Historic Trip to Cuba [5]

Take the Obamas Out to the Ball Game — in Very Stylish Sundresses [6]

Michelle played up the silver crystals on her dress with lovely hoop earrings. She was complemented by Argentine first lady Juliana Awada, who chose a gray lace number in a similar silhouette.

Michelle finished her outfit with embellished Jimmy Choo pumps.

She showed off her well-accessorized outfit from every angle, allowing us to zoom in on the details — check out those scattered pearls.

Michelle also wore a chunky silver ring, playing up the shimmer even more.

Michelle attracted all light in the room, dancing the tango in her metallic outfit.

Shop Michelle's dress below.