Chloe Sevigny (L) and Kate Beckinsale
Credit: Gary Gershoff/WireImage

“It’s so hot in here!” Chloë Sevigny exclaimed Tuesday night at a New York screening of her latest film, Love & Friendship, based on Jane Austen’s novella Lady Susan. However, the actress herself should have claimed a little responsibility for the room's rising mercury due to her eye-catching ensemble: an ethereal peach colored Prada gown with white, sequined collar detailing.

“I was going to wear it in L.A. and I wasn’t able to make it there, so I just decided to wear it tonight,” she told InStyle of her approach to dressing for the evening, which continued later into the night at an after-party inside Vandal. “Part of the bejeweling has come undone, so it needs a stitch, but it looks like it’s holding on for dear life—it’s OK.”

Beyond OK it was. And after dishing on her role in the film—Sevigny portrays Alicia Johnson, an American expat in England and BFF to Lady Susan (Kate Beckinsale)—the always-chic 41-year-old expressed the importance of surrounding yourself with a solid group of girlfriends, like both lead characters do in the flick. “It’s so strong and so important, and that’s part of why I wanted to do the film, 'cause I feel like their relationship is so modern,” she said. “I can relate so much to it and I just wanted to be, or want to be in as many films as I can with female leads and supporting this beautiful woman and her character.”

Meanwhile, 42-year-old Beckinsale stunned the crowd in a navy and sheer Vatanika dress with a feathered mermaid tail. For her, reuniting with Sevigny and director Whit Stillman—they all collaborated on The Last Days of Disco in 1998—was a no-brainer. “It’s quite a lot of years in between,” she said of last having seen Sevigny. “But it was wild to be back in the car being picked up to go to work.”

As for what keeps her grounded, girlfriends are sort of part of the mix. “Some of my girlfriends are gay boys—I do tend to roll with my boy crew quite a bit,” she joked to InStyle. As for whether or not she thinks all girls need a boy squad: “I mean they should [have one] if they don’t, definitely. [It's] central to my life.”