Time is a test of true friendship and, the four main stars of the 2005 flick, "The Sisterhood of the Traveling Pants" have proven that even after almost a decade, their sisterhood continues to be strong.

Over the weekend, stars Blake Lively, Amber Tamblyn and Alexis Bledel reunited to attend their co-star America Ferrera's new play, "Lips Together, Teeth Apart" in New York City. The trio viewed the play on October 18.

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After taking a photo together, Tamblyn posted took to Instagram to post their photo, with the caption, "Go America! Supporting our girl in her play, Lips Together, Teeth Apart. #sisterhood."

Ferrera also posted the same photo on her Twitter account and expressed her appreciation for her friends and co-stars' support. "Sisterhood dropped by matinee of #lipstogetherteethapart @2STNYC &made my day! I get by w/a lil' help from my girls," she posted.

After watching Ferrera's play, Tamblyn and Lively headed off to Travis Louie's AFA Gallery Opening. This time, Lively posted her photo with Tamblyn online, thanking her and Louie for a wonderful night. She also commended Louie for being a wonderful artist and all-around human being, while also thanking Tamblyn for "playing dress up with me".

The reunion comes after the four stars met last month for brunch. Tamblyn also posted the said photo on Instagram, captioning it "Brunch with my best b***hes. #sisterhood."

Numerous milestones have occurred in the four stars' lives since their movie opened in theaters in 2005.

Tamblyn tied the knot with "Arrested Development" comedian David Cross in 2012.

Bledel met and fell in love with actor Vincent Kartheiser on the set of "Mad Men" after appearing in several episodes as Kartheiser's love interest. The two got married in June this year.

Ferrera got hitched to actor-director Ryan Piers Williams in 2011.

Lively, on the other hand, is expecting her first child with Ryan Reynold. The couple got married in 2012.