In an October 2015 interview with the online publication Complex, it was reported that Stephanie and Spencer are not on speaking terms, something neither sibling has publicly confirmed or denied.In April 2010, Pratt posed nude for PETA's Be Nice to Bunnies i Phone application, which is intended to help the public find stores and products that are kind to animals.However, upon the realization that they attend the same college, they became friends.

In 2010, the series underwent several casting adjustments and saw Pratt become a primary cast member, joining Patridge, Lo Bosworth, and Kristin Cavallari.

She is the younger sister of Spencer Pratt, also a television personality.

The second half of the season continued with Kristin Cavallari hired as the replacement narrator.

Pratt and Cavallari began as rivals due to conflicts about Audrina Patridge's ex-boyfriend and a report linking Cavallari to drug use, though they would become friends during the following season.

Stephanie talks of her DUI arrest, and her sibling rivalry with Spencer became more intense as his behavior became more erratic.

Stephanie and the rest of the cast either did not mention Spencer or Heidi after the two were permanently axed from the series, or kept their comments focused on how no one knew what the couple were up to, and had avoided any recent contact with them. In 2013, Pratt made several appearances on television in the United Kingdom.

In 2015, Pratt released a memoir, Made in Reality: From the Hills of L. to London's Made in Chelsea , where she talks about how she developed a crystal meth addiction as a teen and struggled with bulimia.

Pratt claims that her parents turned a blind eye on her addiction issues.

In 2006, MTV developed the reality television series The Hills as the spin-off of Laguna Beach: The Real Orange County.