Billie Eilish All Smiles In Tight Swimsuit At Backyard Pool Party

Billie Eilish's fans are used to her smile, but seeing the 22-year-old in swimwear is a rarity. In February, a dedicated Instagram fan account reposted a fun snap as Billie smiled all sunkissed from a backyard while snapping a mirror selfie. Low-key highlighting her fit figure in a bathing suit and multicolor towel, Billie crouched down from a lawn-like space with a pool noodle in the background, and with a bikini-clad female seen next to her, it looked like this was a social occasion. Looking relaxed and happy, the 22-year-old showed a little skin, although not as much as she did last month with her headline-making Fourth of July bikini.

Scroll for the photo. Crouching down barefoot and with natural sunlight pouring all over her, Billie kept colorful in a tight one-piece in dark blue with light blue swirl prints. Wrapping a beach towel in pink, orange, and blue around her torso, the "bad guy" hitmaker largely swathed her curves, instead showing only her shapely arms and shoulders, plus her ankles.

Wearing her locks tied back and styled into bangs, Billie made the most of an outdoor mirror, one also reflecting a nearby girlfriend, who wore a mismatched bikini in brown spot prints and black.

Wearing no makeup, Billie Eilish reminded fans of her good looks. Likewise, of her sense of fun. "Beautiful Billie," one fan replied.

The Hit Me Hard And Soft singer is known for nearly always covering up in her signature baggy wardrobe, but the odd moment will see her flash some flesh. Last month, Billie fronted media outlets for going wild child in her pink string bikini as she put on an eye-popping display to celebrate Independence Day.

Flaunting her killer cleavage in the Soto Worldwide Heatwave Bikini, Billie left little to the imagination as she held a firework while sticking out her tongue, partying late into the night as she wore a white towel around her, plus hoop earrings. The snapshot came inside an Instagram gallery, one now topping 9 million likes. The post even gained celebrity approval from superstar singer Justin Bieber.

Billie Eilish joins the likes of singer Miley Cyrus and model Kendall Jenner in fronting Italian designer Gucci. In this snap, the blue-eyed beauty promoted the label from a lawn while flaunting her curves in a low-cut white tank top paired with khaki cargo pants.

"I am honored to be part of Gucci’s evolution in rethinking tradition,” Billie told Vogue. “It’s a new understanding, and one that isn’t afraid to evolve in a new direction, that truly matters to me," she added.