Siblings Ava and Deacon Phillippe stepped out to celebrate the launch of a new denim capsule collection for Madewell on Thursday night (August 10).

The siblings showed off their effortlessly cool style and posed for several photos together during the event, which was hosted at Soho House’s Holloway House.

They were just two of so many stars in attendance, too!

Keep reading to find out more…

Notably, Sydney Sweeney was there to support her stylist Molly Dickson who created the new collection with Madewell.

Others in attendance included Chloe East, Grace Van Dien, Lucy Hale, Lukas Gage, Sarah Shahi, Sofia Hublitz, Samantha Logan, Stephanie Shepherd, Rainey Qualley, Alexandra Shipp, Phoebe Fisher, Ava Capri, Olivia Welch, Nesta Cooper and husband Peter Van Auker, Zak Steiner, Francesca Reale, Georgie Flores, Noa Fisher, Sofia Hublitz, Michael Vlamis and Aurora Perrineau. We’ve got photos of everyone in the gallery!

Sydney had a very busy Thursday evening. The Euphoria actress also attended Variety’s Power of Young Hollywood event wearing a totally different and very chic outfit. She brought a special guest to the celebration, too.

If you missed it, she recently addressed some rumors about her love life.

FYI: Everyone at the party was wearing Madewell x Molly Dickson.

Scroll through all of the photos from the event in the gallery…