They have a son named Gunner Stone.
In 2006, Heidi began dating Spencer Pratt. In May 2007, Montag and Pratt announced their engagement. During The Hills season finale in December 2007, the couple broke off their engagement. On November 20, 2008, Montag and Spencer had a marriage ceremony in Mexico. No family members were present and the wedding ceremony lasted 15 minutes. Montag and Pratt married a second time on April 25, 2009 in Pasadena, California. On June 8, 2010, Heidi filed for legal separation from Pratt, listing irreconcilable differences as the reason for their separation. On July 30, 2010, Montag filed for divorce, citing irreconcilable differences in the petition. However, the couple called off the divorce in September 2010. In November 2010, Montag and Pratt announced that the reason behind the couple's divorce was to help Montag's career. Later that November, Montag and Pratt renewed their wedding vows.