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Kristin Cavallari attends The Blonds fashion show during Spring 2016 MADE Fashion Week at Milk Studios on September 16, 2015 in New York City.
Credit: Monica Schipper/Getty Images

This might be the most epic throwback photo ever. Former Laguna Beach star Kristin Cavallari shared a #TBT of her and co-star Stephen Colletti from their high school heyday on Instagram, and it'll take you way back.

In the photo, a very young Cavallari smiles big for the camera as she hugs an equally baby-faced Colletti. "Flipping through #BalancingInHeels is a little trip down memory lane. We were babies! #LagunaBeach #HighSchool #TBT," she wrote alongside the 'gram (below). Not only do they look young, but their early aughts hairstyles and outfits are definitely a throwback as well.

The too-cute snap is from Cavallari's new book Balancing in Heels: My Journey to Health, Happiness and Making It All Work (available March 15, $20; amazon.com), where she shares how she juggles her busy work schedule and family, as well as gives fashion, fitness, and wellness advice. One thing's for certain: These two have come a long way.