Hailey Bieber gathered her friends and favorite industry figures for a martini-fuelled night in West Hollywood this week. Celebrating her new role as a face of Chase Sapphire Reserve, Bieber needed a look that struck a balance of elegance and edge—for Bieber, that meant looking to the cool and contoured designs of Ludovic de Saint Sernin.

“I wanted to do something that felt elegant and elevated, but still sexy, and I felt like this dress really captured that,” Bieber exclusively tells Vogue.

Of recent, Bieber and her stylist Dani Michelle have been playing up the luxurious yet playful aesthetic she’s become known for, with business-y skirt suits with a twist via archival Saint Laurent and Calvin Klein, or structured and feminine Ferragamo dresses. Never resting on her sartorial laurels, Bieber has braved a pop of teal in a Tom Ford for Gucci-era shirt and polka-dot capri pants. This sandy brown woollen dress features a close-fitting bustier and falls to her pointy brown Saint Laurent stiletto pumps, with a long leg split—a decidedly more sensual and dramatic look for a fall night out. “I feel like my personal style has a lot of elements that feel really classic and really chic, but then have a little edge of sexiness, because I like to play in that world,” Bieber says. “This dress tackled both things for me.”

For her new campaign promoting the Chase Sapphire Reserve Credit Card (she’s been banking with them since she was a teenager, she says), Hailey Bieber was shot by photographer David Sims. “Working with David is always amazing, I’ve worked with him a few times now,” she says. “I just feel like he’s legendary for many, many reasons, and every time you shoot with him you are reminded of why he’s so legendary.” Bieber’s campaign follows Claudia Schiffer’s, who is both a Chase and Rhode spokesperson.