By Leighton Meester

Copyright eonline

Spotted: Blake Lively feeling nostalgic.

In honor of the 18th anniversary since Gossip Girl’s premiere, Serena van der Woodsen herself celebrated the show by posting a carousel of behind-the-scenes snapshots taken throughout its six-season run.

“This show was my college. It was my education, my social life, my hardwork, my late nights and early mornings, my teacher,” the 37-year-old captioned the never-before-seen pictures she posted on Instagram. “New York City and Silvercup Studios (& sometimes Paris) was my campus for SIX years.”

Many pictures include Leighton Meester, who played Blake’s on-screen best friend and sometimes nemesis Blair Waldorf, and other notable cast members from the series such as Chace Crawford and Ed Westwick—a.k.a Nate Vanderbilt and Chuck Bass.

“So many memories,” Blake continued. “What. A. Decade. What a University.”

Blake also shared a throwback picture with Penn Badgley, who at the time was Blake’s onscreen and offscreen boyfriend, while filming the season one episode “Hi, Society.”