Stephanie Lynn Pratt (born April 11, 1986) is an American reality television personality. In 2007, she rose to prominence after joining the cast of The Hills, a former MTV reality television series, during its third season.

In 2007, Pratt joined the cast of The Hills during the third season, as Spencer's angry sister who confronted Lauren Conrad. She eventually apologized to Lauren and became one of her close friends, causing a rift between her and Spencer. The fourth season saw Pratt's role increased, with more emphasis placed on her personal life and her past drug abuse. During the fifth season, Stephanie worked with Lauren at Kelly Cutrone's People's Revolution, though Lauren ended Pratt's internship, per Cutrone's orders, due to poor performance. Conrad left the series after the first half of the season.