Stephanie Lynn Pratt is a American reality television personality. She is known best for her role as a cast member on MTV's The Hills.

She is regularly featured on E!'s The Soup. Pratt currently attends Fashion Institute of Design and Merchandising. She started the rumor that her brother Spencer and his wife Heidi Montag were tortured while on the set of I'm A Celebrity... Get Me Out Of Here!. However, the couple later denied that they had been tortured.

Pratt is the younger sister of Spencer Pratt, and the sister-in-law of Heidi Montag (both of whom are on The Hills.) She has struggled with bulimia in the past due to the pressure to be thin stemming from appearing alongside very thin co-stars on the show. In a 2007 US Magazine interview, Pratt revealed previous substance abuse problems and discussed an incident in which she shoplifted $1,300 worth of merchandise from a Neiman Marcus in Honolulu in 2006, whilst working as a production assistant on ABC's "LOST".

On October 18, 2009, Pratt was arrested in Hollywood, California, on suspicion of drunk driving and booked into jail in Van Nuys. She took two breathalyzer tests, first blowing 0.08, then blowing 0.09. The legal limit in California is 0.08. She was released several hours later after posting a $5,000 bail.

In April, 2010, Pratt posed nude for PETA's Be Nice to Bunnies iPhone application, which is intended to help the public find stores and products that are kind to animals.