The pair talked about what Lauren Conrad was like as a child.
LC said: "Our house was in Orange County. The back was a huge canyon, and I was a really big tomboy when I was little. I'd always go hiking and I had a rock collection. And I'd come back up and... you get ticks! They're gross!"
Lauren Conrad also revealed that she is taking a computer class at the FIDM with none other than Stephanie Pratt! Drama! David Letterman also referred to the other Pratt - Spencer - as a new, which was a pretty funny moment.
Check out the video HERE!