Lauren, her best friend Lo Bosworth and their Laguna Beach High School classmates headed back to Laguna, California, on Saturday for a formal catch-up, as it has been 10 years since they graduated.
Sharing a snap of herself and Lauren on Instagram, Lo made reference to the film Romy and Michele's High School Reunion, saying: "Um, we invented Post-Its. #LBHS10YearReunion @laurenconrad."
Meanwhile, the girls' former Laguna Beach and The Hills cast mate Jennifer Bunney shared a snapshot of herself and her husband Taylor Dunphy at the event.
She said: "Great time seeing old friends last night and introducing myself as Jen Dunphy #lbhs10yrReunion."
Kristin was not present at the reunion, however, after being accused by fans of deliberately avoiding it, she pointed out that she was in the wrong year group to attend!
"I didn't go to the Laguna Beach HS reunion this past weekend bc I didn't graduate with that class. I was a year behind everyone else," she tweeted.
Can't grumble at that excuse!
In the 10 years since the show first aired on MTV, a lot has happened. In September, Lauren married her now-husband William Tell while Lo has moved to New York to train at culinary school.
Meanwhile, can you remember Christina Schuller and Morgan Olson? They are both mums now!
See what all the cast are doing now in our Laguna Beach gallery below: