Sisterhood of the traveling pants

Sisterhood of the traveling pants, BFFs on Broadway! The stars of the coming-of-age film The Sisterhood of the Traveling Pants reunited once again in NYC on Saturday, Oct. 18.

Mom-to-be Blake Lively, Alexis Bledel, and Amber Tamblyn all took an adorable selfie together before heading into a showing of Lips Together, Teeth Apart, to support their former costar America Ferrera.

Go America!" Tamblyn captioned the Instagram snapshot. "Supporting our girl in her play, Lips Together, Teeth Apart. #sisterhood." (Earlier this week, Lively made her first red carpet appearance in the Big Apple since announcing she's expecting a baby with husband Ryan Reynolds.)

"Look who dropped by my matinee today and made my day!" Ferrera added, reposting the snapshot.  "#MySisterhood! Love these women and the support they constantly show."

The old friends caused a frenzy with Sisterhood fans when they reunited for brunch on Sept. 15. "Always a good day when I'm with my sisters #DeLosPantalones Love these amazing women," Ferrera wrote via Instagram at the time. Tamblyn added: "Brunch with my best bitches."

An insider recently told Us that Lively told her Sisterhood gals that she was expecting during the fun get-together, even though she waited until Oct. 6 to tell the rest of the world via her Preserve lifestyle site.

Finally I can share my little sister's good news!" Tamblyn captioned Lively's first baby bump pic hours after the reveal. "Congratulations my Blakey, you beautiful woman you. What a tremendous mama you are going to be."