Heidi Montag believes she has learned from her past mistakes and is a better person for those experiences.

Heidi Montag

Heidi Montag

The 'Hills' star - who first appeared on the original version of the reality show which ran for four years until 2010 - admitted she has grown a lot over the last decade, and she is glad to be back on the small screen with husband Spencer Pratt and their 20-month-old son Gunner.

She told 'Extra': "It's really fun to have it be part of our family now because it was such a big part of our relationship ... to incorporate our son, it's different this time. It's fun to learn from our mistakes and move forward in a more positive, responsible manner."

Spencer previously praised 'The Hills' reboot - which premiered on June 24 - for allowing Heidi to set "boundaries" between herself and Gunner, as she learned how to gradually give the tot space.

Spencer recently said: "[It] was incredible for ... being healthy parents, having boundaries. We started with ... a 20-minute dinner with FaceTiming, checking in. It was a process."

In October last year, Heidi posted an emotional video on her Instagram Story to celebrate Gunner's first birthday, in which she said she was a "total mess" over the important milestone.

She said in the clip: "I decided not to wear makeup today because I'm a total mess. God, it's so amazing. Gunner is just such a blessing and I can't believe that it's already been a year. Wow, what a day.

"It's been the most amazing and most challenging year of my entire life. It's just been so great, every moment. I can't believe he's already 1! ... Bit emotional today, it's a big day. And I'm just really thankful. I hope you guys are all having a great day. And I'm just going to sit here crying."

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