- Her last name is the German word for Monday.
- She enjoys martial arts and grappling. Heidi trains Brazilian Jiu-Jitsu with black belt teacher Kevin Casey.
- Younger sister of Holly Montag.
- Her former The Hills (2006) co-star Jennifer Bunney is godmother to her son Gunner.
- Held a marriage ceremony with boyfriend Spencer Pratt in Mexico on November 20, 2008. The marriage was not legal as a marriage license was never obtained and there was no civil ceremony.
- Is of Irish and German descent.
- Has a son, Gunner Stone Pratt (b. October 1, 2017), with her husband Spencer Pratt.
- Launched her clothing line called "Heidiwood". (April 2008)
- Daughter of Darlene Egelhoff.
- Ranked #36 on the Maxim magazine Hot 100 of 2008 list.
- Sister-in-law of Stephanie Pratt and Richard Wilson.
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