Rihanna's effortlessly cool outfits are now a case study in micro-trend ballet flat styling.

On Thursday, July 11, Rihanna was photographed going for a late-night walk with her boyfriend, Asap Rocky, in New York City. Her outfit for the evening was a semi-sheer zebra print two-piece set that brought her fenty magic to life. The pajama-like corset featured an oversized blouse that let the breeze through, and the bra was tucked into a cropped front, apparently paired with coordinating wide-leg pants.

Anti's singer went for streetwear for most of her accessories. She paired her baggy loungewear with a navy blue New York Yankees hat, XXL silver hoop earrings, and a sleek black leather shoulder bag.

Rihanna completed her outfit with an unlikely shoe trend. Instead of chunky Puma sneakers, her relaxed pants were pooled over her legs, revealing silver ballet flats.

Lili has been bringing her pajamas from home to the streets lately. The day before, on Wednesday, July 10, the musician and slash entrepreneur showed off a high-low look, wearing a gray Jawara Alleyne graphic T-shirt with Puma sweatpants and Ottlinger x Puma platform sneakers. The "high" part of this look came from her $1,750 Gucci tote bag (and thousands of dollars worth of gold and silver jewelry).

However, Rihanna makes an interesting choice: ballet shoes. It is not every day that the "Diamonds" singer is photographed wearing a dainty style. Rihanna's metallic flats came at the height of the balletcore trend (an aesthetic focused on flat shoes inspired by tulle, ruffles, bows, and of course, ballerinas).

Ballet flats, once a central (and controversial) staple of the 2000s and 2010s, have now made a much cooler comeback. From mesh to satin, stars like Bella Hadid, Kaia Gerber, Hailey Bieber, and many more have combined flats in different ways over the past few years.

Among these flats, shiny silver pairs are getting new attention. Tory Burch designed a metallic version of the flat toe favored by Katie Holmes, while Jennifer Lawrence wears a studded pair all over by the same designer.

Now that Rihanna is on board, it seems silver ballet flats are the breakout style to try. Store them below.