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Kristin Cavallari, Stephen Colletti

Instagram

Don't even try to top Kristin Cavallari's throwback Thursday pic.

The 29-year-old mother of three Instagrammed an epic high school photo with her former Laguna Beach co-star Stephen Colletti, noting, "We were babies!"

This snap, Kristin noted, is from her new book Balancing in Heels: My Journey to Health, Happiness and Making It All Work. We're guessing it's from around 2004, back in the days where Kristin and Lauren Conrad both had a thing for Stephen...remember how much drama that caused?!

After two seasons of Laguna Beach, Stephen bid adieu to reality TV. He went on to attend San Francisco State University and later became an actor. He played Chase Adams on One Tree Hill from 2007 to 2012, and in 2008 he briefly revisited his reality TV roots for an episode of The Hills called "A Date with the Past."

Kristin and Lauren continued with Laguna Beach for its third season and then moved on to The Hills. Both have gone on to get married (Kristin to Jay Cutler in 2013 and Lauren to William Tell in 2014) and launch careers in the lifestyle and fashion arena.

Lauren has written a book on style, one on party planning and even a fictional series of novels. Kristin's first book, Balancing in Heels, hits stores March 15.