Celebrity This Picture Proves Blake Lively and Her Traveling Pants Co-Stars Are BFF in Real Life By Lara Walsh Lara Walsh Lara Walsh is a Chicago-based writer and editor who covers all things fashion, celebrity, pop culture, travel, and food. When she’s not avidly planning her next trip, she’s writing posts for her travel blog or mapping out her next foodie adventure. InStyle's editorial guidelines Updated on June 24, 2016 @ 09:00AM Pin Share Tweet Email Photo: Ray Tamarra/GC Images It's been 11 years since a relatively unknown Blake Lively starred as a member of the inseparable Sisterhood of the Traveling Pants quartet in the 2005 film based off the popular book series, and we're happy to report that this foursome looks like they're actually best friends in real life as well! The Shallows actress called out co-stars Alexis Bledel, America Ferrera, and Amber Tamblyn in a sweet Instagram post on Wednesday as a nod to the #LeanInTogether campaign, which encourages women to support each other. In the shot, the smiling actresses pose for a group picture on a plane. Lively, who looks fresh-faced wearing a black fedora, has her arm around Tamblyn. blakelively/Instagram The 28-year-old captioned the picture, "Not just my friends, but my sisters, my mentors, my inspiration-- Artists, poets, activists, women. We can and do empower each other." VIDEO: Blake Takes NYC -- See How She Dressed Her Baby Bump 8 Great Ways! She then referenced the #LeanInTogether social media campaign, continuing, "When women support each other, we accomplish amazing things. Celebrate the women who #LeanInTogether with you." Traveling Pants Co-Stars Blake Lively and Amber Tamblyn Reunite for a Cute Photo A third Sisterhood film is rumored to be in the works, and we can't wait to see these four besties back on the big screen.