Spencer William Pratt (born August 14, 1983) is an American reality television personality. In 2007, he began dating Heidi Montag, a primary cast member of the reality television series The Hills. Subsequently, he came to prominence after being cast in the series. Their relationship ultimately ended Montag's friendship with fellow cast member Lauren Conrad. The ensuing feud among the three became the central focus of the series, and was carried through each subsequent season.