Kristin Cavallari just shared one of most perfect throwback Thursday's pictures for "Laguna Beach" fans. The 29-year-old mother of three posted a picture with her high school boyfriend Stephen Colletti during their time on the popular MTV show.

"A little trip down memory lane," Cavallari captioned the picture on Instagram of her with her arm around Colletti. "We were babies!"

Cavallari and Colletti famously brought the drama to "Laguna Beach" with their relationship, which also included a love triangle with future "The Hills" star Lauren Conrad. The two dated off-and-on with Conrad also vying for the attention of Colletti during their three seasons on the MTV show from 2004-2006, according to Us Weekly.

 Flipping through #BalancingInHeels is a little trip down memory lane. We were babies! Link in bio #LagunaBeach #HighSchool #TBT

A photo posted by Kristin Cavallari (@kristincavallari) on Feb 18, 2016 at 8:18am PST

After "Laguna Beach," Colletti quit the realty TV game for the most part and went on the star as Chase Adams on "One Tree Hill" from 2007 to 2012, with the exception of a single "The Hills" episode in 2008 called "A Date with the Past." Cavallari and Conrad kept to their reality roots, with both going on to star in "The Hills."

Since leaving the television world, Cavallari went on to marry Chicago Bears quarterback Jay Cutler in 2013, according to E! News. Cavallari and Cutler have three children together, sons Camden, 3, Jaxon, 21 months, and a 2-month-old daughter named Saylor. After failing to find love on both "Laguna Beach" and "The Hills," Conrad herself settled down in September 2014 when she married William Tell.

Cavallari's first lifestyle book, "Balancing in Heels," hits stores March 15.