The 28-year-old fashion designer was also joined at the event by her Hills frenemy Jen Bunney, who brought along husband Taylor Dunphy.
Fellow Laguna Beach stars Stephen Colletti, Trey Phillips, and other 2004 graduates attended as well!
“Um, we invented Post-Its. #LBHS10YearReunion @laurenconrad,” Lo captioned an Instagram photo, of course quoting the 90s comedy Romy and Michele’s High School Reunion.
TELL JJJ: Can you believe it’s been 10 years since the Laguna Beach kids graduated?