Stephanie Lynn Pratt (born April 11, 1986) is an American television personality. In 2007, she came to prominence after being cast in a supporting role in the reality television series The Hills, which documented the personal and professional lives of Lauren Conrad, Heidi Montag, Audrina Patridge, and Whitney Port. In 2010, the series underwent several casting adjustments and saw Pratt become a primary cast member, joining Patridge, Lo Bosworth, and Kristin Cavallari.
Stephanie Lynn Pratt is the younger sister of Spencer Pratt, and the sister-in-law of Heidi Montag (both of whom appeared on The Hills).
In 2006, MTV developed the reality television series The Hills as the spin-off of Laguna Beach: The Real Orange County. It originally chronicled the lives of Lauren Conrad, who appeared on its predecessor, her housemate Heidi Montag, and friends Audrina Patridge and Whitney Port. In 2007, Pratt's brother Spencer began dating and later moved into an apartment with Montag, which led to the deterioration of her friendship with Conrad.