Heidi Montag (born September 15, 1986 in Crested Butte, Colorado) is an American reality television personality best known for appearing on the MTV reality television series The Hills. Montag works as an event planner for Bolthouse Productions and is also an aspiring singer.

Montag appeared in every episode of seasons one and two of The Hills, and appeared in season three, which aired on MTV on August 13, 2007.

The nature of Montag's role in future seasons of The Hills is unclear since she is no longer living with Conrad and no longer speaks with her because of conflicts which occurred during their time as roommates, which surrounded Montag's relationship with Spencer Pratt. Despite a major role on the show, she did not appear on The Hills: Finale After Party, broadcast live from MTV's New York headquarters or The Hills: MTV Canada Finale After Show (filmed at MTV's Toronto studios).