WATCH: 'Sisterhood of the Traveling Pants' stars Blake Lively, Amber Tamblyn reunite for Halloween

Blake Lively attends the "Free Guy" New York Premiere at AMC Lincoln Square Theater on August 03, 2021 in New York City.
Photo credit Getty Images

Actor pals Blake Lively and Amber Tamblyn reunited to give fans a spooky and funny Halloween treat on Sunday.

Of course there’s a history between the two, as People points out. The pair starred alongside America Ferrera (“Ugly Betty”) and Alexis Bledel (“Gilmore Girls”) in the beloved 2005 comedy-drama, “The Sisterhood of the Traveling Pants, and the 2008 sequel, based on the young adult novels by Ann Brashares.

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The cast celebrated the movie's 16th anniversary back in June. But it seems like Lively and Tamblyn have a habit of hanging out -- as we find out in this fun Instagram video.

Amblyn captioned it, "@BettyBuzz really has outdone itself on marketing by sending me this gorgeous box of tasty refreshments and a life-size Blake Lively Halloween mannequin for my front yard.”

Then when you play the clip, sure enough Tamblyn first shows off a nice gift box from Lively's drink mixer brand, Betty Buzz.

“So pretty! This is the biggest package I’ve ever received in the mail… And then there was like a person inside the package. It was really weird.”

As she goes into the “It was really weird” part, she pans up to reveal Lively standing over her shoulder, sporting a brunette wig, a red sequined cloth draped over her head, and a very blank smiling stare.

Back in December of last year, long before the mini June reunion, Lively told People how important the bond has been between the group, first set in that classic film series.

"America Ferrara, Amber Tamblyn, Alexis Bledel – those are three women who I met when I was 16 years old,” said Lively, “and I've been lucky to call them my friends and mentors ever since.”

Lively added that "what they do -- whether artistically, politically, socially, personally -- they really use their voice, and whether people agree with their voice or not is not the thing that I'm most concerned with as much as, it's nice to see women who are not only empowering themselves but empowering other women to stand up and to really fight and work for what they believe in.”

Lately, the “Gossip Girl” alum has taken up the cause of making sure paparazzi don’t hassle stars’ children, while raising her own kids with a pretty big star himself, Ryan Reynolds.

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