After moving to Los Angeles in 2006, the Laguna Beach spin-off series The Hills was developed to chronicle the lives of then-housemates Conrad and Montag and friends Audrina Patridge and Whitney Port.
That year, she began a short-lived relationship with Jordan Eubanks; she described its end as "the best decision of [her] life".
By the second season, Montag and Conrad's friendship had deteriorated after the former began dating and later moved in with Spencer Pratt.
During the third season, Conrad ended her friendship with Montag after she suspected that Pratt was responsible for rumors of a sex tape involving her and her former boyfriend Jason Wahler; the ensuing feud carried through each subsequent season.

In August, she entered the music industry and began recording her debut studio album.
Later that month, the song "Body Language" was leaked on the internet, and featured an uncredited rap verse from Pratt.
The following month, she confirmed to Us Weekly that she had undergone a breast augmentation and rhinoplasty five months prior.
Montag's first promotional single and its accompanying music video "Higher" were released in February 2008.

Later that same month, she appeared on the cover of Maxim.
Montag collaborated with Anchor Blue to launch her first clothing line "Heidiwood" in April.
Her contract was not renewed the following year after the company decided against featuring celebrity endorsements in future advertising.

After several additional unauthorized leaks, Montag enlisted songwriter Cathy Dennis to continue work on her album.
She released her first two extended plays Wherever I Am and Here She Is... in 2009.
The former included the song "More Is More"; debuting at number 50 on the US Billboard Hot Dance Club Songs chart, it became her first and only song to chart in the country.
Later that year, she and Pratt appeared on the second season of the American version of I'm a Celebrity...Get Me Out of Here!
in support of the "Feed the Children" foundation.
They quit after Montag was hospitalized with a gastric ulcer and later created controversy after alleging that they were subject to torture during production.
After leaving the series, Montag and Pratt became notorious for their antics and antagonistic roles, notably during an interview with Al Roker of Today, and were described as "everything that's wrong with America".
In August, she performed her first official single, the finished version of "Body Language", at the Miss Universe 2009; her appearance was met with a negative critical response, who criticized its overall production.
The following month, she appeared on the cover of Playboy.
In November, Montag and Pratt released the book How to Be Famous: Our Guide to Looking the Part, Playing the Press, and Becoming a Tabloid Fixture.

In January 2010, Montag revealed to People that she had undergone ten cosmetic surgery procedures in a single day two months prior, performed by Frank Ryan.
Among the procedures were brow-lifts, ear-pinnings, a chin reduction, as well as a second rhinoplasty and second breast augmentation.
She commented that she almost died from too much Demerol, reducing her heart rate to five beats per minute.
Her debut studio album Superficial was digitally released later that month to an overwhelmingly negative critical response from critics.
The self-funded record cost nearly $2 million and sold approximately 1,000 copies in first-week downloads, failing to earn back the money spent making it.
In May, she and Pratt made their final appearance on The Hills halfway through the sixth and final season.
After moving to Los Angeles in 2006, the Laguna Beach spin-off series The Hills was developed to chronicle the lives of then-housemates Conrad and Montag and friends Audrina Patridge and Whitney Port. That year, she began a short-lived relationship with Jordan Eubanks; she described its end as "the best decision of [her] life". By the second season, Montag and Conrad's friendship had deteriorated after the former began dating and later moved in with Spencer Pratt. During the third season, Conrad ended her friendship with Montag after she suspected that Pratt was responsible for rumors of a sex tape involving her and her former boyfriend Jason Wahler; the ensuing feud carried through each subsequent season.
In August, she entered the music industry and began recording her debut studio album. Later that month, the song "Body Language" was leaked on the internet, and featured an uncredited rap verse from Pratt. The following month, she confirmed to Us Weekly that she had undergone a breast augmentation and rhinoplasty five months prior. Montag's first promotional single and its accompanying music video "Higher" were released in February 2008. 
Later that same month, she appeared on the cover of Maxim. Montag collaborated with Anchor Blue to launch her first clothing line "Heidiwood" in April. Her contract was not renewed the following year after the company decided against featuring celebrity endorsements in future advertising.
After several additional unauthorized leaks, Montag enlisted songwriter Cathy Dennis to continue work on her album. She released her first two extended plays Wherever I Am and Here She Is... in 2009. The former included the song "More Is More"; debuting at number 50 on the US Billboard Hot Dance Club Songs chart, it became her first and only song to chart in the country. Later that year, she and Pratt appeared on the second season of the American version of I'm a Celebrity...Get Me Out of Here! in support of the "Feed the Children" foundation. They quit after Montag was hospitalized with a gastric ulcer and later created controversy after alleging that they were subject to torture during production. After leaving the series, Montag and Pratt became notorious for their antics and antagonistic roles, notably during an interview with Al Roker of Today, and were described as "everything that's wrong with America". In August, she performed her first official single, the finished version of "Body Language", at the Miss Universe 2009; her appearance was met with a negative critical response, who criticized its overall production. The following month, she appeared on the cover of Playboy. In November, Montag and Pratt released the book How to Be Famous: Our Guide to Looking the Part, Playing the Press, and Becoming a Tabloid Fixture.
In January 2010, Montag revealed to People that she had undergone ten cosmetic surgery procedures in a single day two months prior, performed by Frank Ryan. Among the procedures were brow-lifts, ear-pinnings, a chin reduction, as well as a second rhinoplasty and second breast augmentation. She commented that she almost died from too much Demerol, reducing her heart rate to five beats per minute. Her debut studio album Superficial was digitally released later that month to an overwhelmingly negative critical response from critics. The self-funded record cost nearly $2 million and sold approximately 1,000 copies in first-week downloads, failing to earn back the money spent making it. In May, she and Pratt made their final appearance on The Hills halfway through the sixth and final season.
Heidi Montag