In 2007 Colletti appeared as himself in an episode of another MTV Reality Television series The Hills.
In January 2007, it was announced that Colletti was cast in a major recurring role during the fourth season of The CW teen drama series One Tree Hill.
Colletti portrayed the role of Chase Adams, a high school student who plans to save himself until marriage.
Over the course of the following seasons Colletti maintained a major recurring role.
Thrilled to attend, screen and discuss the show with a live audience in June. The couple was seen closely eyeing some pricey bling in a couple of major jewelry stores — especially major diamond baubles that could only be described as the kind usually slipped on a woman’s left-hand ring finger. (read more)According to some insiders, they'll soon be engaged. Rumor Explodes on Twitter Naturally, the Sun-Times’ article sent Facebook and Twitter into a frenzy. The newspaper also added that people who claim to be close to the couple are “convinced” an engagement is inevitable. Fans were simultaneously mourning and celebrating the news. Many other fans were crushed because they hoped to marry him... The adorable Dieter is just one of the many stars to have tied the knot since the show ended its two-year run in 2006. To make the reunion even sweeter, Schmitz's longtime besties couldn't seem more impressed with Isabel. Hiebl in every post celebrating the couple's nuptials!Seriously, these good friends are just too cute — it's nice to see they've all maintained contact since their days at MTV!In honor of Patriot Day, the couples will be dancing to songs about America.On Friday morning (February 23, 2018) the American Sun-Times reported Stephen Colletti and girlfriend, to be shopping for engagement rings."Normal high school relationships are dramatic enough, but ours now had the added pressure of being seen by MTV viewers across the country as well as being manipulated by the show's producers."Surprisingly, the producers had a bigger effect, as they controlled and mapped our lives more than we were aware.It's been more than a decade since Kristin Cavallari got her start on MTV's "Laguna Beach." And while many cast members have since come forward to reveal the reality show was most definitely not all reality, Cavallari insists her relationship with costar Stephen Colletti was the real deal."What Stephen and I had together was real, and that's what made me get through the producers' attempt at manipulating us," Cavallari writes in her new book "Balancing in Heels: My Journey to Health, Happiness, and Making It All Work." "We talked about everything the entire time.